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The expression for the induced emf conta...

The expression for the induced emf contains a negative sign `(xi=-(dphi)/(dt))`. The significance of the negative sign is given by the statement

A

The induced emf is produced only when the magnetic flux decreases

B

The induced emf opposes the changes in the magnetic flux

C

The induced emf is opposite to the direction of the flux

D

none of the above.

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