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(D) The displacement current $I_d$ is defined by the formula $I_d = \varepsilon_0 \frac{d\phi_E}{dt}$,where $\phi_E$ is the electric flux.Since the el

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Varying

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(D) The displacement current $I_d$ is defined by the formula $I_d = \varepsilon_0 \frac{d\phi_E}{dt}$,where $\phi_E$ is the electric flux.Since the electric flux $\phi_E = E \cdot A = \frac{V}{d} \cdot A$ (where $V$ is the potential difference and $d$ is the distance between plates),the displacement current is proportional to the rate of change of the potential difference: $I_d = \frac{\varepsilon_0 A}{d} \frac{dV}{dt}$.Therefore,for a displacement current to exist,the potential difference $V$ across the plates must be changing with time (i.e.,$\frac{dV}{dt} 
eq 0$).

Displacement current is set up between the plates of a capacitor when the potential difference across the plates is ..............

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