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Q.

Which of the following statements is true for a solenoid?

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a

A solenoid is made up of a magnet

b

Inside a solenoid, the electric field is zero

c

A solenoid does not behave like a magnet

d

A strong magnetic field is produced inside a solenoid

answer is D.

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Detailed Solution

The correct option is

4

.
A solenoid is a long coil with a circular loop of insulated copper wire. When current flows through it, magnetic field lines are generated around the solenoid, producing the same magnetic field as a bar magnet. As a result, the magnetic field within the solenoid is uniform and parallel to the axis of the solenoid.
The strength of the magnetic field in a solenoid is given by

B = \frac{μ_{0} NI}{l}

Where

N =

number of turns

l =

length of the solenoid

I =

current in the solenoid

μ_{0} =

absolute permeability of air or vacuum
The magnetic field inside a solenoid is strong and uniform.
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Which of the following statements is true for a solenoid?