( Please check the answer once again : It is not mentioned that the two magnets are moving from two equidistant points because of which they cancel each other. )Use the following information to answer the next question.

The given figure shows a coil of insulated wire having a large number of turns. It is wrapped around a hollow cylindrical object. The free ends of the coil are connected to a galvanometer.

Two identical magnets are brought close to the hollow cylinder with the same speed but from the opposite directions.

If the like poles of the magnets are brought toward the cylinder, then

Options

• the galvanometer will show a momentary deflection

• a continuous current will be induced in the circuit

• the pointer of the galvanometer will remain at zero

• an alternating current will flow through the circuit

Answer:

When a magnet is moved inside a coil or the coil is moved keeping the magnet stationary or both are moved relative to each other, a current is induced in the solenoid. This is caused by the change in magnetic flux in the solenoid, which in turn generates an induced current in the coil. This phenomenon is known as electromagnetic induction. If a galvanometer is connected to the coil, then its pointer will show a deflection.

In the given situation, if the like poles of the two magnets are brought toward the cylinder from the opposite directions, then the magnetic flux generated by them will be opposite to each other. As a result the magnetic flux generated by the two will be cancelled out. Since no net magnetic flux will be present in the circuit, no induced current will be present either. Hence, the galvanometer pointer will remain un-deflected.

The correct answer is C.