Question

a6-A 105 rot ton co

Answer 1

Magnetic field at a distance r from a long straight current wire = B = u₀I/2$\pi$r

Magnetic field at the center of the loop is Bc= u₀I₁/2$\pi$(r+0.05)

= 2×10^-7×20/0.2= 4×10^-5 T

Inward the plane of loop

(2) force on AD = msgnetic field at AD× current I₂ × length AD

= u₀I₁I₂L/(2$\pi$r)= 2×10^-7×20×12/(0.15)= 3.20×10^-5N leftwards towards strait wire

Force of BC arm = 2×10^-7×20×12×0.3/0.25= 1.92×10^-5N rightwards.

(3) net force on loop = (3.20-1.92)×10^-5N = 1.08×10^-5 N leftwards