Derive the expressions for the potential energy of a system of point charges.

Explain the Lightning arrester or lightning conductor.

Derive a relation between internal resisance and emf of a cell.

Tabulate the difference between Coulomb's law and Biot-Savort's law.

In a certain region of space, electric field \(\vec { E } \) and magnetic field \(\vec { B } \) are perpendicular to each other. An electron enters the region perpendicular to the direction of both \(\vec { B } \) & \(\vec { E } \) and moves undeflected. Find the velocity of the electron.

Can a galvanometer be used for measuring the current? Explain.

How does the capacitive reactance depend on frequency? & What is the reactance of a capacitor at hertz to the study at?

The charge on a parallel plate capacitor varies as q = q_o cos 2\(\pi \gamma \)t. The plates are very large and close together. (area - A. separation - d) find the displacement current through the capacitor?

Define refractive index of a medium.

What is thin lens?

List out the laws of photoelectric effect. (or) Write any three Laws of Photoelectric Effect

(i) Draw a graph showing variation of photoelectric current (I) with anode potential (V) for different intensities of incident radiation. Name the characteristic of the incident radiation that is kept constant in this experiment.
(ii) If the potential difference used to accelerate electrons is doubled, by what factor does the de-Broglie wavelength associated with the electrons change?

Write the properties of neutrino?

What is electronics?

Why space wave propagation is limited upto small distance over earth's surface?

Write the aim of artificial intelligence in robots.