As a result of a change in the magnetic flux linked to a closed loop, an emf of V volt is induced in the loop. The work done in taking a charge Q coulomb once around the loop is

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(1) QV. An emf is defined as the work done per unit charge in taking a charge once round the circuit: V=W/Q. So W=QV. It is worth noticing why this is not zero. The electric field induced by a changing magnetic flux is not conservative: its line integral round a closed path is exactly the emf, not zero, which is what Faraday's law says. A static electric field would give zero here.

As a result of a change in the magnetic flux linked to a closed loop, an emf of V volt is induced in the loop. The work done in taking a charge Q coulomb once around the loop is

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