Question

An arc of a circle of radius R subtends an angle $\frac { \pi } { 2 }$ at the centre. It carries a current i. The magnetic field at the centre will be

• A. $\frac { \mu _ { 0 } i } { 2 R }$
• B. $\frac { \mu _ { 0 } i } { 8 R }$
• C. $\frac { \mu _ { 0 } i } { 4 R }$
• D. $\frac { 2 \mu _ { 0 } i } { 5 R }$

Answer 1

Answer: (B)

$\frac { \mu _ { 0 } i } { 8 R }$

Answer 2