Question

Choose the correct statement from the following:
The strength of a solenoid can be increased by increasing the number of turns.
The magnetic field due to a solenoid is similar to the magnetic field produced by a bar magnet.

• A. Only A is true
• B. Only B is true
• C. Both A and B are true
• D. Both A and B are false

Answer 1

The correct option is C Both A and B are true

The strength of a solenoid can be increased by increasing the number of turns.Higher the number of turns, higher the length and thus the amount of current carrying coil material in use is higher and thus higher the magnetic field due to increased amount of current flowing through the solenoid as a result of the increased number of turns. Magnetic Field is given by firmula $B=\mu NI$ in which N is number of turns.

A cylindrical Coil of wire whose diameter is small compared to its length is known as a Solenoid. It can be used to generate an essentially uniform Magnetic Field similar to that of a bar Magnet,when a Current is running through it. The Magnetic Field is directed along the axis of the Solenoid.

Both the staements are true