Discussion
Faraday's law states that the induced electromotive force round a circuit equals
Answer: A
Correct answer: the negative rate of change of the flux linking it
\[ \mathrm{emf} = -\frac{\mathrm{d}\Phi}{\mathrm{d}t}. \] Two features matter. It is the *rate of change* that induces, so a large steady flux induces nothing; and the minus sign is Lenz’s law, which makes the induced current oppose the change that produced it - without it, energy would not be conserved.
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