Question

Which expression relates induced emf to the change in magnetic flux for a coil of \[N\] turns?

Options

• \[\varepsilon=\int\vec B\cdot d\vec A\]

• \[\varepsilon=-N\frac{d\Phi_B}{dt}\]

• \[\varepsilon=-N\Phi_B\]

• \[\varepsilon=NBA\cos\theta\]

Answer 1

Induced emf depends on the rate of change of magnetic flux. For a coil of \[N\] turns, the expression is \[\varepsilon=-N\frac{d\Phi_B}{dt}\].