Question

A current I flowing through the loop as shown in the adjoining figure. The magnetic field at centre O is-

• A.
• B. $\frac { 7 \mu _ { 0 } \mathrm { I } } { 16 \mathrm { R } } \odot$
• C.
• D.

Answer 1

Answer: (A)

Answer 2

B = B₁ + B₂ = $\left( \frac { \pi / 2 } { 2 \pi } \right)$

= $\frac { 3 } { 8 }$ $\frac { 7 } { 16 }$ Ä