A coil of area 500 cm2 having 1000 turns is placed such that the plane of the coil is perpendicular to a magnetic field of magnitude 4 × 10-5weber/m2. If it is rotated by 180° about an axis passing through one of its diameter in 0.1 sec, find the average induced emf.

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A coil of area 500 cm<sup>2</sup> having 1000 turns is placed such that the plane of the coil is perpendicular to a magnetic field of magnitude 4 × 10<sup>-5</sup>weber/m<sup>2</sup>. If it is rotated by 180° about an axis passing through one of its diameter in 0.1 sec, find the average induced emf.