Question

A long copper tube of inner radius R carries a current i. The magnetic field B inside the tube is

• A. $\frac { \mu _ { 0 } i } { 2 \pi R }$
• B. $\frac { \mu _ { 0 } i } { 4 \pi R }$
• C. $\frac { \mu _ { 0 } i } { 2 R }$
• D. Zero

Answer 1

Answer: (D)

Zero

Answer 2

Magnetic field inside the hollow conductor (tube) is zero.