Question

In the figure, shown the magnetic induction at the centre of there arc due to the current in portion AB will be

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

Answer 1

Answer: (D)

Zero

Answer 2

The magnetic induction at $O$due to the current in portion $A B$ will be zero because $O$lies on $A B$ when extended.