The electric mains in house are marked 220V, 50 Hz. Write down the equation of instantaneous voltage.

Write down the four Maxwell's equations.

Write down Maxwell's equations for steady electric field.

A charged capacitor is connected to an inductor at an instant of time t=0.If the capacitor and the inductor are taken to be pure, write down the equation of effective potential difference across the combination at any instant of time t and solve it for instantaneous current through I the combination.Explain brefly the exchange of electric and magnetic energy between the capacitor and the inductor.