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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. Which of the following statements gives the correct description of the happenings when the switch S is closed?

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a

B2 lights up earlier and finally B1 shines brighter than B2

b

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

c

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

d

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

answer is C.

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Detailed Solution

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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 B1 shines brighter than B2.

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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. Which of the following statements gives the correct description of the happenings when the switch S is closed?