Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 14

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

According to Lenz’s law of electromagnetic induction

A
The induced e.m.f is in the direction opposing the change in magnetic flux.

B
The relative motion between the coil and magnet produces change in magnetic flux.

C
Only the magnet should be moved towards magnet

D
Only the coil should be moved towards magnet
Solution
- Lenz's Law states that: ”The direction of an induced e.m.f is such that it will always oppose the change that is causing it”.
- In other words, an induced current will always OPPOSE the motion or change which started the induced current in the first place and this idea is found in the analysis of Inductance.
Question 2
1 / -0

A cylindrical bar magnet is kept along axis of a circular coil. If the magnet is rotated about its axis, then

A
A current will be induced in a coil

B
No current will be induced in a coil

C
Only an e.m.f will be induced in the coil

D
An e.m.f and a current both will be induced in the coil

Solution

A cylindrical bar magnet is kept along the axis of the circular coil. If the magnet is rotated about its axis, then there will not any induce e.m.f as well as induce current, because when we rotate the magnet about it axis there is not any change in magnetic flux.
Question 3
1 / -0

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

Solution

Lenz's law is used for determining the direction of induced current. Lenz's law of electromagnetic induction states that the direction of induced current in a given magnetic field is such that it opposes the induced change by changing the magnetic field.
Question 4
1 / -0

According to Faraday’s law of electromagnetic induction which of the following is true?

A
Conservation of charge

B
Conservation of magnetic flux

C
Conservation of energy

D
Newton’s law of equal and opposite forces

Solution

Faraday's law describes the magnitude of the electromotive force (e.m.f.) generated in a conductor due to electromagnetic induction. It states that the induced e.m.f. in a conducting circuit is directly proportional to the rate of change of magnetic flux linkage, Φ, with the circuit.
Question 5
1 / -0

The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane along the perpendicular direction. The direction of the induced current in the conducting plane will be

A
Horizontal

B
Vertical

C
Clockwise

D
Anticlockwise

Solution

(1) When the North Pole moves towards the vertical plane, the magnetic flux increases. By Lenz's Law, the induced current will be such that it opposes this change, i.e., it opposes the approaching north pole. Therefore, a current loop in the anti-clockwise direction will flow

(2) When seen from the North Pole, such that the field induced by this anti-clockwise current is in opposite direction to the field by the North Pole and hence opposes it.