Changing Current - Bulb Brightness In each case shown below, a long straight wir

Question

Changing Current - Bulb Brightness In each case shown below, a long straight wire is sitting next to a circular wire loop that has a small light bulb in it. The currents in the long wires are changing at uniform rates. The initial current, the final current, and the time interval during which the change occurs are given in each figure. The bulbs and wire loops are all identical, and the straight wires are all the same distance from the wire loops. Rank the bulb brightness during the time that the current changes. Greatest 1 ____ 2 ____ 3 ____ 4 ____ 5 ____ 6 ____ Least

Explanation / Answer

v = L (If - Io)/t

so, v will be higher for the bulb with higher (Ifinal - Iinitial)/t and so the brightness

calculating (Ifinal - Iinitial)/t-

for

A.13

B.5

C.4.66

D.5

E.4

F.4

so brightness order

greatest............................least

A > B = D > C > E = F

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