At maximum torque, sin(θ) = 1, so we can write:
τ_max = n * B * A * I
We are given τ_max = 0.14 N·m, n = 200 turns, B = 0.98 T, and the dimensions of the coil (3.0 cm by 6.0 cm). We can find the area A of the coil:
A = length * width = 0.03 m * 0.06 m = 0.0018
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