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

B₂ lights up earlier and finally B₁ shines brighter than B₂

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

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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