Calculate the number of electrons in one coulomb of negative charge.

Calculate the electric field at points P, Q for the following two cases, as shown in the figure.
(a) A positive point charge +1 μC is placed at the origin.
(b) A negative point charge -2 μC is placed at the origin.

Explain in detail Coulomb’s law and its various aspects.

Discuss the various properties of conductors in electrostatic equilibrium.

A potential difference across 24 Ω resistor is 12 V. What is the current through the resistor?

Resistance of a material at 20^oC and 40^oC are 45 Ω and 85 Ω respectively. Find its temperature coefficient of resistivity.

How the emf of two cells are compared using potentiometer?

Let the magnetic moment of a bar magnet be \(\overset { \rightarrow }{ { p }_{ m } } \) whose magnetic length is d = 2l and pole strength is q_m. Compute the magnetic moment of the bar magnet when it is cut into two pieces
(a) along its length
(b) perpendicular to its length.

Show the time period of oscillation when a bar magnet is kept in a uniform magnetic field is \(T=2\pi \sqrt { \frac { 1 }{ { p }_{ m }B } } \) in second, where I represents a moment of inertia of the bar magnet, p_m is the magnetic moment and B is the magnetic field.

Two materials X and Y are magnetised whose values of intensity of magnetisation are 500 A m^–1 and 2000 A m^–1 respectively. If the magnetising field is 1000 A m^–1, then which one among these materials can be easily magnetized?

Obtain a relation for the magnetic field at a point along the axis of a circular coil carrying current using Biot-Savart law.

Explain the principle and working of a moving coil galvanometer.

A circular antenna of area 3 m² is installed at a place in Madurai. The plane of the area of antenna is inclined at 47^o with the direction of Earth’s magnetic field. If the magnitude of Earth’s field at that place is 4.1 x 10^–5 T find the magnetic flux linked with the antenna.

The self-inductance of an air-core solenoid is 4.8 mH. If its core is replaced by iron core, then its self-inductance becomes 1.8 H. Find out the relative permeability of iron.

Obtain an expression for motional emf from Lorentz force.

How are the three different emfs generated in a three-phase AC generator? Show the graphical representation of these three emfs.

Compare the electromagnetic oscillations of LC circuit with the mechanical oscillations of blockspring system qualitatively to find the expression for angular frequency of LC oscillator.

Explain the Maxwell’s modification of Ampere’s circuital law.

Derive the equation for effective focal length for lenses in out of contact

Discuss about the simple microscope and obtain the equations for magnification for near point focusing and normal focusing.

Light travelling through transparent oil enters in to glass of refractive index 1.5. If the refractive index of glass with respect to the oil is 1.25, what is the refractive index of the oil?

A monochromatic light is incident on an equilateral prism at an angle 30^o and is emergent at an angle of 75^o . What is the angle of deviation produced by the prism?

Explain how frequency of incident light varies with stopping potential.

Briefly explain the principle and working of electron microscope.

Derive the energy expression for an electron is the hydrogen atom using Bohr atom model.

Describe the working of nuclear reactor with a block diagram.

Calculate the radius of  \(_{ 79 }^{ 197 }{ Au }\) Au nucleus.

Explain the construction and working of a full wave rectifier

State Boolean laws. Elucidate how they are used to simplify Boolean expressions with suitable example.

Explain the basic elements of communication system with the necessary block diagram.

Elaborate any two types of Robots with relevant examples.