Search results for "Resistivity"

Physics

Edexcel2024

2 3 Resistivity Thin lens equation ρl R = 1 1 1 A + = u v f Current Magnification for a lens ΔQ I = image height v Δt m = = object height u I = nqvA Diffraction grating Materials nλ = d sin θ Density Refractive index m ρ = n sin θ = n sin θ V 1 1 2 2 c Stokes’ law n = v F = 6πηrv Critical angle Hooke’s law

Question

Physics

Edexcel2024

Electrical power is transmitted from Norway to Britain using a cable laid under the North Sea. The following information is published on a website. The cable has a diameter of 15 cm and a length of 720 km. It is made of copper of resistivity 1.7 × 10–8 Ω m. The electrical power transmitted from Norway is 1400 MW and the transmission potential difference is 1100 kV. The efficiency of this process is almost 100%. Deduce, by calculation, whether the claim for efficiency is correct. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. (Total for Question 12 = 6 marks) *P74468A0824* 

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Physics

Edexcel2023

2 3 Resistivity Thin lens equation ρl R = 1 1 1 A + = u v f Current Magnification for a lens ΔQ I = image height v Δt m = = object height u I = nqvA Diffraction grating Materials nλ = d sin θ Density Refractive index m ρ = n sin θ = n sin θ V 1 1 2 2 c Stokes’ law n = v F = 6πηrv Critical angle Hooke’s law

Question

Physics

Edexcel2023

*P71915A0928*  Turn over DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD PMT E (c) The resistivity ρ of the conducting material is given by ρ = j where E is the electric field strength. Show that the units are the same on both sides of this equation. (4) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. (Total for Question 12 = 7 marks) *P71915A01028* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD PMT

Question

Physics

Edexcel2022

A potential divider circuit may contain a component known as a potentiometer. One type of potentiometer consists of a track with terminals X and Y at either end. There is a sliding contact that can move along the track connected to a terminal Z as shown. track end view of track 115 mm X Y t sliding contact 5.0 mm Z 5.0 mm The length of the track is 115 mm and the width is 5.0 mm. (a) The resistance of the track between terminal X and terminal Y is 12.0 kΩ. Calculate the thickness t of the track. resistivity of track material = 0.49 Ω m (3) ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... t = ....................................................... 

Question

Physics

Edexcel2022

2 3 Resistivity Thin lens equation ρl R = 1 1 1 A + = u v f Current Magnification for a lens ΔQ I = image height v Δt m = = object height u I = nqvA Diffraction grating Materials nλ = d sin θ Density Refractive index m ρ = n sin θ = n sin θ V 1 1 2 2 c Stokes’ law n = v F = 6πηrv Critical angle Hooke’s law

Question

Physics

Edexcel2021

2 3 Resistivity Thin lens equation ρl R = 1 1 1 A + = u v f Current Magnification for a lens ΔQ I = image height v Δt m = = object height u I = nqvA Diffraction grating Materials nλ = d sin θ Density Refractive index m ρ = n sin θ = n sin θ V 1 1 2 2 c Stokes’ law n = v F = 6πηrv Critical angle Hooke’s law

Question

Physics

Edexcel2021

*P67096A01532* Turn over PMT The insulator is a type of plastic and should have a resistivity greater than 1014 Ω m. Deduce whether the plastic used in this capacitor has a resistivity greater than this value. A = 5.6 × 10−3 m2 d = 0.6 × 10−6 m (5) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. (Total for Question 13 = 9 marks)

Question

Physics

Edexcel2020

2 3 Resistivity Thin lens equation ρl R = 1 1 1 A + = u v f Current Magnification for a lens ΔQ I = image height v Δt m = = object height u I = nqvA Diffraction grating Materials nλ = d sin θ Density Refractive index m ρ = n sin θ = n sin θ V 1 1 2 2 c Stokes’ law n = v F = 6πηrv Critical angle Hooke’s law

Question

Physics

Edexcel2020

*P61864RA0928* Turn over PMT (b) A shunt of this resistance was usually made from Manganin wire. Calculate the length of Manganin wire of radius 0.95 mm required to make this shunt. resistivity of Manganin = 4.55 × 10−7 Ω m (3) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. Length = ...................................................... (Total for Question 12 = 6 marks)

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