A bar magnet and a solenoid are kept beside each other. In which of the following cases current will not be produced?

When the magnet is moving towards the solenoid

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When the solenoid is moving towards the magnet

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When both magnet and solenoid is moving in the same direction with the same speed

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When both magnet and solenoid is moving in the opposite direction with the same speed

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Solution

The correct option is C When both magnet and solenoid is moving in the same direction with the same speed
Whenever a bar magnet is moved toward the solenoid or solenoid is moved toward the bar magnet, there is a change in the magnetic flux linked with a coil. Hence an emf is induced in the coil and current is generated.
Induced current is generated when there is relative motion between magnet and solenoid.
When both magnet and solenoid is moving in the same direction with the same speed, there is no relative motion between the bar magnet and solenoid. Therefore, no current is produced in such cases.

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Similar questions

Q. 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 The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly.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 solenoid
(c) at rest inside the solenoid
(d) moving out of the solenoid

If I stretch out a solenoid I get a straight wire. Both in solenoid and straight wire moving charges are producing magnetic field then why is magnetic field of a straight wire solenoid and a circular wire different shouldnt it be same in all?

The only way to induce current in a solenoid is by moving a magnet near the solenoid.

Q. Question 4
For a current in a long straight solenoid N- and S-poles are created at the two ends. Among the following statements, the incorrect statement is

(a) The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid
(b) The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil
(c) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet
(d) The N- and S-poles exchange position when the direction of current through the solenoid is reversed

Q. If a current carrying coil is close to a magnet and both are moving with the same speed in same direction, what is the effect on induced current ?

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