In the figure magnetic energy stored in the coil is:

1. Zero 2. Infinite
3. 25 joules 4. None of the above
Subtopic:  LR circuit |
 84%
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A solenoid of inductance L and resistance R is connected to a battery of e.m.f. E. Maximum value of magnetic energy stored in the inductor is:

1. E22R
2. E2L2R2
3. E2LR 
4. E2L2R

Subtopic:  LR circuit |
 82%
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When the current in the portion of the circuit shown in the figure is 2 A and increases at the rate of 1 A/s, the measured potential difference Vab = 8 V. However, when the current is 2 A and decreases at the rate of 1 A/s, the measured potential difference Vab = 4 V. The value of R and L is:

1. 3 Ω and 2 H respectively
2. 3 Ω and 3 H respectively
3. 2 Ω and 1 H respectively
4. 3 Ω and 1 H respectively

Subtopic:  LR circuit |
 71%
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The figure shows three circuits with identical batteries, inductors, and resistors. Rank the circuits according to the current, in descending order, through the battery (i) just after the switch is closed and (ii) a long time later:

1. \((i) i_2>i_3>i_1\left(i_1=0\right) (ii) i_2>i_3>i_1\)
2. \((i) i_2<i_3<i_1\left(i_1 \neq 0\right) (ii) i_2>i_3>i_1\)
3. \((i) i_2=i_3=i_1\left(i_1=0\right)\left(\right. (ii) i_2<i_3<i_1\)
4. \((i) i_2=i_3>i_1\left(i_1 \neq 0\right) (ii) i_2>i_3>i_1\)
Subtopic:  LR circuit |
 71%
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The key K is inserted at time t= 0. The initial (t=0) and final t currents through the battery are:
                               

1. \(\frac{1}{15}~A,~\frac{1}{10}~A\)
2. \(\frac{1}{10}~A,~\frac{1}{15}~A\)
3. \(\frac{2}{15}~A,~\frac{1}{10}~A\)
4. \(\frac{1}{15}~A,~\frac{2}{25}~A\)

Subtopic:  LR circuit |
 70%
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The network shown in figure is a part of a complete circuit. If at a certain instant, the current 'i' is 10 A and is increasing at the rate of 4×103 A/sec, then VA-VB is:

  

1. 6 V 2. -6 V
3. 10 V 4. -10 V
Subtopic:  LR circuit |
 66%
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In the circuit diagram shown in figure, R = 10 \(\Omega\), L = 5 H, E = 20 V and i = 2 A. This current is decreasing at a rate of 1.0 A/sVab at this instant will be:

1. 40 V 2. 35 V
3. 30 V 4. 45 V
Subtopic:  LR circuit |
 58%
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A series combination of inductance (L) and resistance (R) is connected to a battery of emf E. The final value of current depends on:

1. L and R                           

2. E and R 

3. E and L                           

4. E, L, and R

Subtopic:  LR circuit |
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The resistance in the following circuit is increased at a particular instant. At this instant the value of resistance is 10 Ω. The current in the circuit will be:

1. i = 0.5 A

2. i > 0.5 A

3. i < 0.5 A

4. i = 0

Subtopic:  LR circuit |
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Switch S of the circuit shown in the figure is closed at t = 0. If e denotes the induced emf in L and i denotes the current flowing through the circuit at time t, then which of the following graphs is correct?

1.  2.
3. 4.
Subtopic:  LR circuit |
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