Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 25

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Weekly Quiz Competition

Question 1
4 / -1

In an ac circuit the emf (e) and the current (i) at any instant core given respectively by e = E_osinωt, I = I_osin(ωt – φ). The average power in the circuit over one cycle of ac is.

A

B

C

D
Question 2
4 / -1

A

B

C

D
Question 3
4 / -1

A

B

C

D

Solution
Question 4
4 / -1

Same current is flowing in two alternating circuits. The first circuits contains only inductance and the other contains only a capacitor. If the frequency of the emf of ac is increased the effect on the value of the current will be.

A
Increase in the first circuit and dicrease in other

B
Increase in both the circuit

C
Decrease in both the circuit

D
Decrease in the first and increase in other
Question 5
4 / -1

The value of alternating emf E in the given circuit will be.

A
100 V

B
20 V

C
220 V

D
140 V
Question 6
4 / -1

A
10 m A

B
20 m A

C
40 m A

D
80 m A
Question 7
4 / -1

In a region of uniform magnetic induction B = 10^-2 tesla, a circular coil of radius 30 cm and resistance π² ohm is rotated about an axis which is perpendicular to the direction of B and which forms a diameter of the coil. If the coil rotates at 200 rpm the amplitude of the alternating current induced in the coil is,

A
4π² mA

B
30 mA

C
6 mA

D
200 mA

Solution
Question 8
4 / -1

The power factor of a good choke coil is

A
Nearly zero

B
Exactly zero

C
Nearly one

D
Exactly one
Question 9
4 / -1

When 100 volt dc is applied across a coil, a current of 1A flows through it. When 100 volt ac at 50 cyle s^–1 is applied to the same coil, only 0.5 A current flows. The impedance of the coil is,

A
100Ω

B
200Ω

C
300Ω

D
400Ω
Question 10
4 / -1

An LC circuit contains a 20 mH inductor and a 50 μF capacitor with an initial charge of 10 mc. The resistance of the circuit is negligible. At the instant the circuit is closed be t = 0. At what time is the energy stored completely magnetic.

A
t = 0

B
t = 1.54 ms

C
t = 3.14 ms

D
t = 6.28 ms

Solution