Alternating Current Test

Result

Alternating Current Test - 28

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Weekly Quiz Competition

Question 1
4 / -1

In a series resonant L-C-R circuit, the voltage across R is 100 V and R =1 kΩ with C = 2µF. The resonant frequency co is 200 rad s^-1. At resonance, the voltage across L is

A
2.5 × 10^-2 V

B
40 V

C
250 V

D
4 × 10^-3 V

Solution
Question 2
4 / -1

A fully charged capacitor C with initial charge q₀ is connected to a coil of self inductance L at t = 0. The time at which the energy is stored equally between the electric and the magnetic fields is

A

B

C

D

Solution
Question 3
4 / -1

At time t = 0, a battery of 10 V is connected across points A and B in the given circuit. If the capacitors have no charge initially, at what time (in sec) does the voltage across them become 4 V? (take, ln 5 =1.6, ln 3 =1.1)

A
2

B
3

C
2.5

D
3/2

Solution
Question 4
4 / -1

In the circuit shown below, the key K is closed at t = 0. The current through the battery is

A

B

C

D

Solution
Question 5
4 / -1

An inductor of 2 H and a resistance of 10Ω are connected in series with a battery of 5 V. The initial rate of change of current is

A
0.5 As^-1

B
2.0 As^-1

C
2.5 As^-1

D
0.25 As^-1

Solution
Question 6
4 / -1

The time constant of the given circuit is

A

B

C

D
None of these

Solution
Question 7
4 / -1

An inductor (L=100 mH) a resistor (R =100Ω) and a battery (E =100 V) are initially connected in series as shown in the figure. After a long time the battery is disconnected after short circuiting the points A and B. The current in the circuit 1 ms after the short circuit is

A
(1/e) A

B
e A

C
0.1 A

D
1 A

Solution
Question 8
4 / -1

A

B

C

D

Solution
Question 9
4 / -1

Find the time in which current becomes 81 mA, when the switch S is closed at t= 0.

A
5.5 ms

B
11.65 ms

C
15 ms

D
19.6 ms

Solution
Question 10
4 / -1

Current from A to B in the straight wire is decreasing. The direction of induced current in the loop, Fig. is

A
clockwise

B
anticlockwise

C
changing

D
nothing can be said