Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 13

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Question 1
4 / -1

A copper disc of radius 0.1 m is rotated about its centre with 20 rev/s in an uniform magnetic field of 0.1 T with its plane perpendicular to the field. The emf induced across the radius of the disc is

A

B

C
20 π mV

D
10 π mV

Solution
Question 2
4 / -1

A circular coil of radius R = 10 cm having 500 turns and total resistance 2 Ω is placed initially perpendicular to the earth's magnetic field of 3 × 10^-5 T. The coil is rotated about its vertical diameter by an angle 2π in 0.5 . The induced current in the coil is

A
0.5 mA

B
1.0 mA

C
1.5 mA

D
3.0 mA

Solution
Question 3
4 / -1

A boat is moving due East in a region where the earth's magnetic field is 5.0 × 10^-5 NA^-1 m^-1 due North and horizontal. The boat carries a vertical aerial 2 m long. If the speed of the boat is 1.50 ms^-1 , the magnitude of the induced emf in the wire of aerial is

A
0.75 mV

B
0.50 mV

C
0.15 mV

D
1 mV

Solution
Question 4
4 / -1

A horizontal straight wire 20 m long extending from East to West is falling with a speed of 5.0 ms^-1 , at right angles to the horizontal component of the earth's magnetic field 0.030 ×10^-4 Wbm^-2 . The instantaneous value of the emf induced in the wire will be

A
6.0 mV

B
3 mV

C
4.5 mV

D
1.5 mV

Solution
Question 5
4 / -1

Electric fields induced by changing magnetic fields are

A
conservative

B
non-conservative

C
may be conservative or non-conservative depending on the condition

D
nothing can be said
Question 6
4 / -1

A square loop of wire, side length 10 cm is placed at angle of 45° with a magnetic field that changes uniformly from 0.1 T to zero in 0.7 s. The induced current in the loop (its resistance is 1 Ω ) is

A
1.0 mA

B
2.5 mA

C
3.5 mA

D
4.0 mA

Solution
Question 7
4 / -1

A 50 turns circular coil has a radius of 3 cm, it is kept in a magnetic field acting normal to the area of the coil. The magnetic field B increased from 0.10 T to 0.35 T in 2 ms. The average induced emf in the coil is

A
1.77 V

B
17.7 V

C
177 V

D
0.177 V

Solution
Question 8
4 / -1

A current passing through a coil of self inductance of 2 mH changes at the rate of 20 mAs^-1 . The emf induced in the coil is

A
10 µV

B
40 µV

C
10 mV

D
40 mV

Solution
Question 9
4 / -1

An inductor having coefficient of self induction 40 mH. What is the energy stored in it, when a current of 2 A is passed through it ?

A
40 mJ

B
80 mJ

C
20 mJ

D
100 mJ

Solution
Question 10
4 / -1

Magnetic flux linked with a coil is ϕ = 5t² + 2 t + 3, where t is in sec and ϕ is in weber. At time t =1 s, the value of induced emf in volt.

A
14

B
1.2

C
12

D
6

Solution