Electric force in a current carrying wire is given by:
F = i*LxB
F = i*L*B*sin theta
Now theta = 90 deg, for top side of loop, where theta = angle between current and magnetic field
i = current in upper side = 11.0 A
L = length of upper side = a = 22.0 cm = 0.22 m
B = Magnetic field = 7.80 T
So,
F = 11.0*0.22*7.80*sin 90 deg
F = 18.88 N
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