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Number of turns on the circular coil, n = 20
Radius of the coil, r = 10 cm = 0.1 m
Magnetic field strength, B = 0.10 T
Current in the coil, I = 5.0 A
(a) The total torque on the coil is zero because the field is uniform.
(b) The total force on the coil is zero because the field is uniform.
(c) Cross-sectional area of copper coil, A = 10−5 m2
Number of free electrons per cubic meter in copper, N = 1029 /m3
Charge on the electron, e = 1.6 × 10−19 C
Magnetic force, F = Bevd
Where,
vd = Drift velocity of electrons
= I / NeA
F = 5 * 10^-25 N
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