Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 31

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Weekly Quiz Competition

Question 1
4 / -1

When a bar magnet falls through a long hollow metal cylinder fixed with its axis vertical, the final acceleration of the magnet is

A
Equal to zero

B
Less than g

C
Equal to g

D
Equal to g in the beginning and then more than g
Question 2
4 / -1

A

B
AB

C

D
Question 3
4 / -1

A magnet NS is suspended from a spring and while it oscillates, the magnet moves in and out of the coil C. The coil is connected to a galvanometer G. Then as the magnet oscillates,

A
G shows deflection to the left and right with constant amplitude

B
G shows deflection on one side

C
G shows no deflection

D
G shows deflection to the left and right but the amplitude steadily decreases
Question 4
4 / -1

A coil having n turns and resistance R Ω is connected with a galvanometer of resistance 4 R Ω This combination is moved in time t seconds from a magnetic field W₁ weber to W₂ weber. The induced current in the circuit is

A

B

C

D

Solution
Question 5
4 / -1

A square loop of side 22 cm is converted into circular loop in 0.4 s. A uniform magnetic field of 0.2 T directed normal to the loop then the e.m.f. induced in the loop is

A
6.6 × 10^–3 V

B
6.6 × 10^–5 V

C
4.6 × 10^–4 V

D
4.60 × 10^–8 V

Solution
Question 6
4 / -1

If a coil of 40 turns and area 4.0 cm² is suddenly removed from a magnetic field, it is observed that a charge of 2.0 × 10^–4 C flows into the coil. If the resistance of the coil is 80 Ω, the magnetic flux density in Wb/m² is

A
0.5

B
1.0

C
1.5

D
2.0

Solution
Question 7
4 / -1

In an AC generator, a coil with N turns, all of the same area A and total resistance R, rotates with frequency ω in a magnetic field B. The maximum value of e.m.f. generated in the coil is

A
N.A.B.

B
N.A.B.R

C
N.A.B. ω

D
N.A.B.R. ω

Solution
Question 8
4 / -1

The diagram below shows two coils A and B placed parallel to each other at a very small distance. Coil A is connected to an ac supply. G is a very sensitive galvanometer. When the key is closed

A
Constant deflection will be observed in the galvanometer for 50 Hz supply

B
Visible small variations will be observed in the galvanometer for 50 Hz input

C
Oscillations in the galvanometer may be observed when the input ac voltage has a frequency of 1 to 2 Hz

D
No variation will be observed in the galvanometer even when the input ac voltage is 1 or 2 Hz
Question 9
4 / -1

An infinitely long cylinder is kept parallel to a uniform magnetic field B directed along positive z–axis. The direction of induced current as seen from the z axis will be

A
Clockwise of the +ve z axis

B
Anticlockwise of the +ve z axis

C
Zero

D
Along the magnetic field
Question 10
4 / -1

The magnetic flux across a loop of resistance 10 Ω is given by ɸ = 5t² – 4t + 1 weber. How much current is induced in the loop after 0.2 sec?

A
0.4 A

B
0.2 A

C
0.04 A

D
0.02 A

Solution