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Magnetic Field of a Solenoid
Mohan tightly wound a very long copper wire on a PVC pipe and carefully took the pipe out. The two ends of the copper wire then attached to a battery.
This cylindrical shape of copper wire showed few properties of a bar magnet. Later he found that it is called a solenoid and this solenoid is used in several devices such as door bell, relay switch etc. The magnetic field of a solenoid is given below.
image
The magnetic field strength of a solenoid having n turns is `B=mu_0nl`, where, `I` is the current flowing in the solenoid.

The strength of magnetic field in a solenoid cannot be increased by
Options:
(a) decreasing its length (b) increase the value of current
(c) introduce a magnetic and material inside the coil (d) increase the number of turns

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