Radius of a circular ring is changing with time and the coil is placed in uniform magnetic field....

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Radius of a circular ring is changing with time and the coil is placed in uniform magnetic field
\( \mathrm{P} \)
perpendicular to its plane. The variation of ' \( r \) ' with time ' \( t \) ' is shown in the figure. Then induced e.m.f. \( \varepsilon \) with time will be best represented by:
\( (1) \)
(2)
(3)
(4)


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