Which one of the following expressions gives the magnitude of the magnetic field…

PHYSICS · Single correct · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism

Problem

Which one of the following expressions gives the magnitude of the magnetic field inside a long, tightly-wound air-cored solenoid carrying a current

I

with

n

turns per unit length? (a)

B = \dfrac{\mu_0 n I}{2\pi}

(b)

B = \dfrac{\mu_0 n I}{2}

(c)

B = \mu_0 n I

(d)

B = \dfrac{\mu_0 n^{2} I}{2}