Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 60

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Weekly Quiz Competition

Question 1
4 / -1

The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was

A
Moving towards the solenoid

B
Moving into the solenoid

C
At rest inside the solenoid

D
Moving out of the solenoid
Question 2
4 / -1

A coil of resistance 400 Ω is placed in a magnetic field. If the magnetic flux ϕ (Wb) linked with the coil varies with time t (sec) as ϕ = 50 t² + 4. The current in the coilat t = 2 sec is

A
0.5 A

B
0.1 A

C
2 A

D
1 A

Solution
Question 3
4 / -1

A rectangular coil ABCD is rotated anticlockwise with a uniform angular velocity about the axis shown in diagram below. The axis of rotation of the coil as well as the magnetic field B are horizontal. The induced e.m.f. in the coil would be maximum when

A
The plane of the coil is horizontal

B
The plane of the coil makes an angle of 45° with the magnetic field

C
The plane of the coil is at right angles to the magnetic field

D
The plane of the coil makes an angle of 30° with the magnetic field

Solution
Question 4
4 / -1

An electric potential difference will be induced between the ends of the conductor shown in the diagram, when the conductor moves in the direction

A
P

B
Q

C
L

D
M
Question 5
4 / -1

When a wire loop is rotated in a magnetic field, the direction of induced e.m.f. changes once in each

A
1/4 revolution

B
1/2 revolution

C
1 revolution

D
2 revolution
Question 6
4 / -1

An aeroplane in which the distance between the tips of wings is 50 m is flying horizontally with a speed of 360 km/hr over a place where the vertical components of earth magnetic field is 2.0 × 10^–4weber/m². Thepotential difference between the tips of wings would be

A
0.1 V

B
1.0 V

C
0.2 V

D
0.01 V

Solution
Question 7
4 / -1

A copper disc of radius 0.1 m is rotated about its centre with 10 revolutions per second in a uniform magnetic field of 0.1 tesla with its plane perpendicular to the field. The e.m.f. induced across the radius of disc is

A

B

C

D

Solution
Question 8
4 / -1

A metal conductor of length 1 m rotates vertically about one of its ends at angular velocity 5 radians per second. If the horizontal component of earth\'s magnetic field is 0.2 × 10^–4 T, then the e.m.f. developed between thetwo ends of the conductor is

A
5 mV

B
5 × 10^–4 V

C
50 mV

D
50 μ V

Solution
Question 9
4 / -1

A conducting square loop of side L and resistance R moves in its plane with a uniform velocity v perpendicular to one of its sides. A magnetic induction B constant in time and space, pointing perpendicular and into the plane of the loop exists everywhere. Thecurrent induced in the loop is

A

B

C

D
Zero
Question 10
4 / -1

The current carrying wire and the rod AB are in the same plane. The rod moves parallel to the wire with a velocity v. Which one of the following statements is true about induced e.m.f. in the rod

A
End A will be at lower potential with respect to B

B
A and B will be at the same potential

C
There will be no induced e.m.f. in the rod

D
Potential at A will be higher than that at B