Question

Net magnetic field at the center of the circle O due to a current carrying loop as shown in Fig. 21.84 is (θ < 180^o)

(A) zero 

(B) perpendicular to paper inwards

(C) perpendicular to paper outwards 

(D) is perpendicular to paper inwards if θ ≤ 90^o and perpendicular to paper outwards if 90^o ≤  θ <180^o 

Answer 1

Magnetic field B = μ₀I/2R(θ/2π) (- cap k)