The strength of a magnetic field due to a solenoid can be increased by

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Increasing the number of turns in the solenoid

Increasing the current in the solenoid

Winding the solenoid around a magnetic material

All of these

answer is D.

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Detailed Solution

The strength of a magnetic field due to a solenoid can be increased by increasing the number of turns in the solenoid, increasing the current in the solenoid and winding the solenoid around a magnetic material.
A cylindrical coil of wire is a solenoid. When a current flows through it, it behaves like a bar magnet with opposite poles at the ends. If we want to increase the magnetic field in the solenoid, the following measures have to be taken:- (a) Increase the number of turns per unit length. The more the number of turns in a solenoid, the stronger the magnetic field. (b)Increase current: The stronger the magnetic field produced when, the larger the current passed through the solenoid. (c) Winding the solenoid around a magnetic material: Using soft iron as the core in the solenoid increases the magnetic field strength.

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