Question

A thick current carrying cable of radius $'R'$ carries current $'I'$ uniformly distributed across its cross-section. The variation of magnetic field $B ( r )$ due to the cable with the distance $'r'$ from the axis of the cable is represented by :

• A.
• B.
• C.
• D.

Answer 1

Answer: (C)

Answer 2

$B \propto r(0 \leq r \leq R)$ $B \propto \frac{1}{r}(r \geq R)$