State the correct expression for the magnetic field at the centre of a very long…

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Magnetism and Electromagnetism · Magnetism and Electromagnetism

Problem

State the correct expression for the magnetic field

B

at the centre of a very long air-cored solenoid having turn density

n

(turns per metre) and carrying current

I

. (a)

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

(b)

B = \mu_0 n^{2} I

(c)

B = \mu_0 n I

(d)

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