You are given a  \(2\mu F\) parallel plate capacitor. How would you establish an instantaneous displacement current of 1 mA in the space between its plates?

2

(a)

Show that the radiation pressure exerted by an EM wave of intensity I on a surface kept in vacuum is \(\frac{I}{c}\).

2

(a)

What happens to the intensity of light from a bulb if the distance from the bulb is doubled? As a laser beam travels across the length of a room, its intensity essentially remains constant. What geometrical characteristic of LASER beam is responsible for the constant intensity which is missing in the case of light from the bulb?

2

(a)

Even though an electric field E exerts a force qE on a charged particle yet the electric field of an electromagnetic wave does not contribute to the radiation pressure (but transfers energy). Explain.

2

(a)

When an ideal capacitor is charged by a DC battery, no current flows. However, when an AC source is used, the current flows continously. How does one explain this, based on the concept of displacement current?

2

(a)