PhysicsNEET 2020Biot–Savart and Ampère's laws

Moving Charges and Magnetism

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: ( $μ_{0} = 4 π \times 1 0^{- 7} T m A^{- 1}$ )

A. $6.28 \times 1 0^{- 4}$ T✓
B. $3.14 \times 1 0^{- 4}$ T
C. $6.28 \times 1 0^{- 5}$ T
D. $3.14 \times 1 0^{- 5}$ T

You have the answer. The worked solution — and why the other three were written — is part of a paid pack.

Moving Charges and Magnetism

More from this chapter in past papers