Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 48

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Question 1
4 / -1

In the following figure, the magnet is moved towards the coil with a speed v and induced e.m.f. If magnet and coil recede away from one another each moving with speed v, the induced e.m.f. in the coil will be

A
e

B
2e

C
e / 2

D
4e

Solution
Question 2
4 / -1

A current carrying solenoid is approaching a conducting loop as shown in the figure. The direction of induced current as observed by an observer on the other side of the loop will be

A
Anticlockwise

B
Clockwise

C
East

D
West

Solution
Question 3
4 / -1

A conducting wire frame is placed in a magnetic field which is directed into the paper. The magnetic field is increasing at a constant rate. The directions of induced current in wires AB and CD are

A
B to A and D to C

B
A to B and C to D

C
A to B and D to C

D
B to A and C to D

Solution
Question 4
4 / -1

A square metallic wire loop of side 0.1 m and resistance of 1 Ω is moved with a constant velocity in a magnetic field of 2 wb/m² as shown in figure. The magnetic field is perpendicular to the plane of the loop, loop is connected to a network of resistances. What should be the velocity of loop so as to have a steady current of lmA in loop

A
1 cm / sec

B
2 cm / sec

C
3 cm / sec

D
4 cm / sec

Solution
Question 5
4 / -1

A conductor ABOCD moves along its bisector with a velocity of 1 m/s through a perpendicular magnetic field of 1 wb/m², as shown in fig. If all the four sides are of lm length each, then the induced e.m.f. between points A and D is

A
0

B
1.41 volt

C
0.71 volt

D
None of these

Solution
Question 6
4 / -1

A conducting rod PQ of length L = 1.0 m is moving with a uniform speed v = 2 m/s in a uniform magnetic field B = 4.0T directed into the paper. A capacitor of capacity C = 10 µF is connected as shown in figure. Then

A

B

C

D
Charge stored in the capacitor increases exponentially with time

Solution
Question 7
4 / -1

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

A

B

C

D

Solution
Question 8
4 / -1

Shown in the figure is a circular loop of radius r and resistance R. A variable magnetic field of induction B = B₀ e^–t is established inside to coil. If the key (K) is closed, the electrical power developed right after closing the switch is equal to

A

B

C

D

Solution
Question 9
4 / -1

A conducting ring is placed around the core of an electromagnet as shown in fig. When key K is pressed, the ring

A
Remain stationary

B
Is attracted towards the electromagnet

C
Jumps out of the core

D
None of the above
Question 10
4 / -1

The north and south poles of two identical magnets approach a coil, containing a condenser, with equal speeds from opposite sides. Then

A
Plate 1 will be negative and plate 2 positive

B
Plate 1 will be positive and plate 2 negative

C
Both the plates will be positive

D
Both the plates will be negative

Solution