A long solenoid of 50 cm length having 100 turns carries a …

Physics Magnetic Effects of Current Biot-Savart Law Single Correct MCQ

Published on: August 21, 2026

A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A The magnetic field at the centre of the solenoid is :

6.28 x 10 -5 T

3.14x10 -5 T

6.28 x 10 -4 T

3.14x10 -4 T

Text Solution

Verified by Experts

The correct answer is:

Given that,

Length of solenoid, L = 50 cm

Number of turns, N = 100

Current, 1 = 2.5 A

Now,

Magnetic field at centre of solenoid,

=200 turns/ m

I = 2.5 A

By substituting the value of 1 in the equation of magnetic field we get

B = 4 x 10 -7 x200x2.5

= 6.28x10 -4 T

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