Answer:
a)
b) τ = 0.109 N m (max)
Step-by-step explanation:
given
magnetic dipole moment μ = 2.57 Am²
number of turns N = 234
radius r = 1.96 cm = 0.0196 m
using μ = N I A
where I is current and A is area
I = μ/NA
for max torque
we know τ = μΒ
τ = 2.57 ×0.0427
τ = 0.109 N m (max)