Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 72

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Question 1
4 / -1

As shown in the figure a metal rod makes contact and completes the circuit. The circuit is perpendicular to the magnetic field with B = 0.15 tesla. If the resistance is 3 Ω force needed to move the rod as indicated with a constant speed of 2 m/sec is

A
3.75 × 10^–3 N

B
3.75 × 10^–2 N

C
3.75 × 10² N

D
3.75 × 10^–4 N

Solution
Question 2
4 / -1

Two identical coaxial circular loops carry current i each circulating in the clockwise direction. If the loops are approaching each other, then

A
Current in each loop increases

B
Current in each loop remains the same

C
Current in each loop decreases

D
Current in one-loop increases and in the other it decreases
Question 3
4 / -1

In the following figure, the magnet is moved towards the coil with a speed v and induced e.m.f.e. 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 4
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 5
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 6
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 magneticfield 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 7
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. betweenpoints A and D is

A
0

B
1.41 volt

C
0.71 volt

D
None of the above

Solution
Question 8
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 = 4.0 T directed into the paper. A capacitor of capacity C =10µF is connected as shown in figure. Then

A
q_A = + 80 μC and q_B = – 80 μC

B
q_A = – 80 μC and q_B = + 80μC

C
q_A= 0 = q_B

D
Charge stored in the capacitor increases exponentially with time

Solution
Question 9
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
i = 0.5 A

B
i > 0.5 A

C
i < 0.5 A

D
i = 0

Solution
Question 10
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) isclosed, the electrical power developed right after closing the switch is equal to

A

B

C

D

Solution