Two circular loops of wire with small bulbs in them arc sitting beside two long

Question

Two circular loops of wire with small bulbs in them arc sitting beside two long straight current-carrying wires. In both eases, these loops are the same distance away from the current-carrying wires. The wire loops. bulbs, and long straight wires are identical for the two situations but the currents in the straight wires are different. A graph of current in each wire as a function of time is shown at the right below For each labeled time t_1-t_5, state whether the brightness of bulb A is greater than, less than, or equal to the brightness of bulb B. If cither bulb is not lit at all at that time, state that explicitly. Time t_1: Time t_2: Time Time t_4: Time t_5: Find the direction of current flow in the bulbs during each time interval.

Explanation / Answer

1) t1

brigtness of B greater than A, since magnetic flux in B is changing faster

2) t2

A is lit, B is not lit since current is constant no change in flux

3) t3

Both will be lit with equal brightness, since rate of change of current with respect time is same,

4) t4

B brighter than A

since rate of change of FLUX BECAUSE of change in direction is higher in B

5)T5,

both will be not be lit, no change in flux

5) t5 = both

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