Search results for "Electromagnetic Induction"

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Physics

CAIE2024

(cid:44)(cid:1)(cid:1)(cid:1)(cid:1)(cid:9)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:6)(cid:44) (b) There is a uniform magnetic field of flux density 0.18 T into the plane of the page. (i) State Lenz’s law of electromagnetic induction. ........................................................................................................................................... ........................................................................................................................................... ..................................................................................................................................... [2] (ii) Show that the time taken for point X to complete one revolution is 45 ms. [1] (iii) Calculate the magnetic flux cut by spoke AX during one revolution of the wheel. Give a unit with your answer. magnetic flux = .................................... unit ............ [3] (iv) Determine the magnitude of the electromotive force (e.m.f.) induced across spoke AX. induced e.m.f. = ...................................................... V [2] (v) Use Lenz’s law to explain whether the potential is higher at end A or end X of the spoke. ........................................................................................................................................... ........................................................................................................................................... ..................................................................................................................................... [1] [Total: 13] © UCLES 2024 (cid:300) (cid:300) (cid:207) (cid:236) (cid:266) (cid:186) (cid:190) (cid:249) (cid:288) (cid:217) (cid:180) (cid:285) (cid:237) (cid:265) (cid:200) (cid:255) (cid:245) (cid:213) (cid:207) (cid:256) (cid:298) (cid:248) (cid:197) (cid:244) (cid:266) (cid:241) (cid:222) (cid:198) (cid:250) (cid:225) (cid:183) (cid:249) (cid:256) (cid:288) (cid:215) (cid:258) 9702/42/O/N/24 [Turn over (cid:293)(cid:213)(cid:229)(cid:213)(cid:245)(cid:213)(cid:261)(cid:277)(cid:181)(cid:181)(cid:293)(cid:261)(cid:197)(cid:213)(cid:197)(cid:181)(cid:197)(cid:213) NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD PMT * 0000800000006 *

Question

Physics

Edexcel2024

Regenerative braking supplies a current back to the power transmission system whilst slowing a vehicle. The arrangement shown can be used as a regenerative braking system on a train. N S coil connected to wheels to power transmission system copper rings carbon block The coil rotates with the wheels of the train. Two copper rings are connected to the ends of the coil. The rings rotate with the coil and two carbon blocks make electrical contact with the rings as they rotate. (a) Describe how this arrangement can be used as a regenerative brake. (4) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. *P74468A01924* 

Question

Physics

CAIE2023

For Examiner’s Use (a) (i) The coil is 5.0 cm from the face of the magnet. Use Fig. 5.2 to determine the magnetic flux density in the coil. magnetic flux density = T (ii) Hence show that the magnetic flux linkage of the coil is 3.0 × 10-4Wb. [3] (b) State Faraday’s law of electromagnetic induction. [2] (c) The coil is moved along the axis of the magnet so that the distance x changes from x = 5.0cm to x = 15.0cm in a time of 0.30s. Calculate (i) the change in flux linkage of the coil, change = Wb [2] (ii) the average e.m.f. induced in the coil. e.m.f. = V [2] (d) State and explain the variation, if any, of the speed of the coil so that the induced e.m.f. remains constant during the movement in (c). [2] © UCLES 2005 9702/04/SPECIMEN PAPER [Turn over PPPMMMTTT For

Question

Physics

Edexcel2023

An induction hob consists of a coil beneath a sheet of ceramic material. The coil is connected to an alternating current (a.c.) supply as shown. pan ceramic material coil connected to an a.c. supply (a) A steel pan containing water is placed on the induction hob. Explain why the pan becomes hot when the supply is switched on. (4) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. (b) The a.c. supply to the coil in an induction hob has a much higher frequency than normal mains frequency. Explain why this is an advantage in this case. (2) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. (Total for Question 11 = 6 marks) *P71915A0828* 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

CAIE2016

(d) State and explain the variation, if any, of the speed of the coil so that the induced e.m.f. remains constant during the movement in (c). ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [2] [Total: 11] © UCLES 2014 9702/04/SP/16 PPMMTT

Question

Physics

CAIE2016

(a) (i) The coil is 5.0 cm from the face of the magnet. Use Fig. 8.2 to determine the magnetic fl ux density in the coil. magnetic fl ux density = ....................................................... T [1] (ii) Hence show that the magnetic fl ux linkage of the coil is 3.0 × 10−4 Wb. [2] (b) State Faraday’s law of electromagnetic induction. ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [2] (c) The coil is moved along the axis of the magnet so that the distance x changes from x = 5.0 cm to x = 15.0 cm in a time of 0.30 s. Calculate (i) the change in fl ux linkage of the coil, change = ................................................... Wb [2] (ii) the average e.m.f. induced in the coil. e.m.f. = ............................…………………. V [2] © UCLES 2014 9702/04/SP/16 [Turn over PPMMTT

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