Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 57

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Weekly Quiz Competition

Question 1
4 / -1

Lenz\'s law is consequence of the law of conservation of

A
Charge

B
Momentum

C
Mass

D
Energy
Question 2
4 / -1

The magnetic flux through a circuit of resistance R changes by an amount ∆ϕ in time ∆t. The total independent of quantity of electric charge Q which passes during this time through any point of the circuit is given by

A

B

C

D
Question 3
4 / -1

A coil having an area A₀ is placed in a magnetic field which changes from B₀ to 4B₀ in a time interval t. The e.m.f. induced in the coil will be

A

B

C

D

Solution
Question 4
4 / -1

A copper ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet while it is passing through the ring is

A
Equal to that due to gravity

B
Less than that due to gravity

C
More than that due to gravity

D
Depends on the diameter of the ring and the length of the magnet

Solution
Question 5
4 / -1

A square coil of 10^–2m² area is placed perpendicular to a uniform magnetic field of intensity 10³ Wb/m². Themagnetic flux through the coil is

A
10 weber

B
10^–5 weber

C
10⁵ weber

D
100 weber

Solution
Question 6
4 / -1

A magnet is brought towards a coil (i) speedly (ii) slowly, then the induced e.m.f./induced charge will be respecitively.

A
More in first case/More in first case

B
More in first case/Equal in both cases

C
Less in first case/More in second case

D
Less in first case/Equal in both cases
Question 7
4 / -1

The direction of induced e.m.f. during electromagnetic induction is given by

A
Faraday's law

B
Lenz's law

C
Maxwell's law

D
Ampere's law
Question 8
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 tesla to 0.35 tesla in 2 milliseconds. The average induced e.m.f. in the coils is

A
1.77 volts

B
17.7 volts

C
177 volts

D
0.177 volts

Solution
Question 9
4 / -1

A
The rectangular, circular and elliptical loops

B
The circular and the elliptical loops

C
Only the elliptical loop

D
Any of the four loops

Solution
Question 10
4 / -1

A

B

C

D

Solution