A rectangular coil of single turn, having area A, rotates in
a uniform magnetic field B with an angular velocity w about
an axis perpendicular to the field. If initially the plane of
the coil is perpendicular to the field, then the average
induced emf when it has rotated through 90° is
(a)⍵BA/π (b) ⍵BA/2π
(c)⍵BA/4π (d)2⍵BA/π
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