A long cylindrical wire of radius carries a current uniformly distributed over its…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A long cylindrical wire of radius

r

carries a current

I

uniformly distributed over its cross-sectional area. The magnetic field at a distance

x

from the surface, inside the wire, is (a)

\frac{\mu_0 I}{2\pi(r-x)}

(b)

\frac{\mu_0 I}{2\pi x}

(c)

\frac{\mu_0 I}{2\pi(r+x)}

(d) None of these