Growth of Current in an Inductor

Practice Questions:

Question 1: moderate

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 ?

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

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

3. B2 lights up earlier and finally B1 shines brighter than B2

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

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Question 2: moderate

The network shown in the figure is part of a complete circuit. If at a certain instant, the current
I is 5A and it is decreasing at a rate of

\[10^{3} As^{-1} then V_{B}-A_{A} equals\]

1. 20 V

2. 15 V

3. 10 V

4. 5 V

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Question 3: moderate

For the circuit shown in figure R = 10Ω, L = 5H, E = 20 V, i = 2 A. This current is decreasing at
a rate of 1.0 A /s Find Vab at this instant.

1. 45 V

2. 35 V

3. 25 V

4. 40 V

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Question 4: moderate

An ideal coil of 10H is connected in series with a resistance of 5Ω and a battery of 5V. 2 seconds after the connection is made, the current flowing in amperes in the circuit is :

1. (1 - e)

2. e

3. \[e^{-1}\]

4. \[\left( 1-e^{-1} \right)\]

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