Q.

An inductor L, a resistance R and two identical bulbs, B1 and B2 are connected to a battery through a switch S as shown in the figure. The resistance R is the same as that of the coil that makes L. Which of the following statements gives the correct description of the happenings when the switch S is closed

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a

B1 light up earlier and finally both the bulbs acquire equal brightness

b

B2 lights up earlier and finally B1 shines brighter than B2

c

The bulb B2 lights up earlier than B1 and finally both the bulbs shine equally bright

d

B1 and B2 light up together with equal brightness all the time

answer is A.

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Detailed Solution

Initially inductor offers infinite resistance, so , the bulb B1 will not lights up while current will flow instantly through the bulb B2. After reaching saturation, inductance behaves as zero resistance, so, both bulbs will lights up with same brightness as inductor has same resistance that of R.

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An inductor L, a resistance R and two identical bulbs, B1 and B2 are connected to a battery through a switch S as shown in the figure. The resistance R is the same as that of the coil that makes L. Which of the following statements gives the correct description of the happenings when the switch S is closed