Question

What is the significance of the minus sign in the equation emf?

Answer 1

The 'minus' sign used in Faraday's law of electromagnetic induction simply indicates that the induced emf and the change in magnetic flux have opposite signs. According to Faraday's law, when a changing magnetic field is linked with a coil, an emf is induced.

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Answer 2

it indicates that the induced EMF and magnetic flux have opposite signs.