Two identical point charges of magnitude –q are fixed as shown in the figure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement?

An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = V_o – V_A, where V_o is the potential at the origin and V_A is the potential at x = 2 m is _____.

An uncharged metal sphere is placed between two equal and oppositely charged metal plates. The nature of lines of force will be ______________

The magnitude of electric dipole moment of water molecule is

Which of the following statement on equipotential surface is wrong?

Charge Q on a capacitor varies with voltage V as shown in graph, where Q is along X-axis and V along Y-axis. The area of triangle OAB represents

Relative permittivity (ε_r) is also known as ________

Electric field intensity and electric potential are related by_________.

Two wires of A and B with circular cross section made up of the same material with equal lengths. Suppose R_A = 3 R_B, then what is the ratio of radius of wire A to that of B?

Temperature co-effieient of resistance for metals is ______________.

Two identical resistors are connected in parallel then connected in series. The effective resistance are in the ratio ________________.

Thermo electric generators are used in power plants to convert_________ into electricity.

A thin insulated wire forms a plane spiral of N = 100 tight turns carrying a current I = 8 m A (milli ampere). The radii of inside and outside turns are a = 50 mm and b = 100 mm respectively. The magnetic induction at the centre of the spiral is ______.

When the current changes from +2A to −2A in 0.05 s, an emf of 8 V is induced in a coil. The co-efficient of self-induction of the coil is

Which one of them is used to produce a propagating electromagnetic wave?

Write the general definition of electric dipole moment for a collection of point charge.

What is meant by dielectric breakdown?

What is electric power and electric energy?

State Joule’s law of heating.

Mention the ways of producing induced emf.

What is meant by Fraunhofer lines?

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

What are carbon resistors? What does the colour indicates?

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

The magnetic flux passes perpendicular to the plane of the circuit and is directed into the paper. If the magnetic flux varies with respect to time as per the following relation \(\Phi_B\) = (2t³ + 3t² + 8t + 5)mWb, what is the magnitude of the induced emf in the loop when t = 3 s? Find out the direction of current through the circuit.

Explain the working of a single-phase AC generator with necessary diagram.

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

Four charges are arranged at the corners of the square PQRS of side an as shown in the figure.
(a) Find the work required to assemble these charges in the given configuration.
(b) Suppose a charge q is brought to the center of the square, by keeping the four charges fixed at the corners, how much extra work is required for this?

Three points A, B & C lie in a uniform electric field (E) of 5 x 10³ NC^-1 Find the potential difference between A & C.

Calculate the potential at a point P due to charge of 5 x 10^-7Clocated 11cm away.

In a meter bridge, the balancing length is found to be 40 cm from end A. If the resistance of 10 \(\Omega \) is connected in series with R, balancing length is obtained 60 em from A. calculate the value R & S.

A toroidal solenoid with air core has an average radius of 15cm, area of cross section 12cm² and has 2000 turns. Calculate the self- inductance of the toroid. Assume the field to be uniform across the cross-section of the toroid.