For a long air-cored solenoid having turns

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

Problem

For a long air-cored solenoid having

N

turns, length

L

and carrying current

I

, the magnetic field at its centre is (a)

B=\dfrac{\mu_0NI}{2L}

(b)

B=\mu_0\dfrac{IL}{N}

(c)

B=\mu_0\dfrac{NI}{L}

(d)

B=\mu_0\dfrac{N^{2} I}{L}