Скачать или смотреть 20.2b Ex2 FM19 P42 Q8 Change in Balance Reading | A2 Magnetic Fields Cambridge A Level Physics

Example 2 - 9702/42/F/M/19: A horseshoe magnet is placed on a top pan balance. A rigid copper wire is fixed between the poles of the magnet, as illustrated in Fig. 8.1. The wire is clamped at ends A and B.

(a) When a direct current is switched on in the wire, the reading on the balance is seen to decrease. State and explain the direction of:
(i) the force acting on the wire
(ii) the current in the wire.

(b) A direct current of 4.6 A in the wire causes the reading on the balance to change by 4.5 × 10 –3 N. The direct current is now replaced by an alternating current of frequency 40 Hz and root-mean-square (r.m.s.) value 4.6 A. On the axes of Fig. 8.2, sketch a graph to show the change in balance reading over a time of 50 ms.
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