Question

A 25 cm long solenoid has a radius of 10 cm and there are 200 turns. If it carries a current of 2 A then, calculate the magnitude of magnetic field inside the solenoid in Tesla.​

Answer 1

Answer:

magnetic moment of solenoid is given as NiA where N is total number of turns and A is current in coil and A is area of coil o solenoid.

As the solenoid is equivalent of magnet of same size, their magnetic moment will be equal

m

=Ni

A

Magnetization

M

=

V

m

=

Al

m

=

l

Ni

Substituting N=500,i=15A,l=.25m

M

=30,000Am

−1

Hence, correct answer is option B.