Question

A current of i amp flows in the loop having circular arc r metre, subtending an angle as shown in the figure. The magnetic field at centre O of circle is

• A. (A) μ0i4πrθ
• B. (B) 2μ0i4πr2sin⁡θ
• C. (C) 2μ0i2rsin⁡θ
• D. (D) μ0i2rsin⁡θ

Answer 1

Answer: (A)

(A) μ0i4πrθ

Answer 2

Explanation:
Magnetic field due to the current carrying arc at the centre of curvature B=μ0i4πrθ