At a fixed perpendicular distance from a long straight current-carrying conductor

MATHEMATICS · Single correct · ISC · Physics · Magnetic Effects of Current and Magnetism · Ampere's circuital law

Problem

At a fixed perpendicular distance

r

from a long straight current-carrying conductor, how does the magnetic field strength

B

vary with the current

I

? (a)

B \propto I^{2}

(b)

B

is independent of

I

(c)

B \propto I

(d)

B \propto \dfrac{1}{I}