A current A flows along an infinitely long straight thin walled tube

PHYSICS · Single correct · AP · Physics C: Electricity and Magnetism · Magnetic Fields and Electromagnetism · Magnetic Fields and Electromagnetism

Problem

A current

i

A flows along an infinitely long straight thin walled tube, then the magnetic induction at any point inside the tube is- (A) infinite (B) zero (C)

\frac{\mu_0}{4\pi} \cdot \frac{2i}{r}

T (D)

\frac{2i}{r}