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#### 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 × 10-5 weber/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. Option 1) zero Option 2) 30 mV Option 3)   40 mV Option 4)  20 mV

Rate of change of magnetic Flux -

- wherein

change in flux

Average induced EMF =

(since it is turned by

Option 1)

zero

Incorrect

Option 2)

30 mV

Incorrect

Option 3)

40 mV

Correct

Option 4)

20 mV

Incorrect