Question

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 :

(1) 3.41 x 10^-5 T

(2) 6.28 x 10^-4 T

(3) 3.41 x 10^-4 T

(4) 6.28 x 10^-5 T

Answer 1

Correct answer is (2) 6.25 x 10^-4 T