Equi-potential surface due to a point charge seen from a long distance appear as

When two bodies are rubbed against each other, they are electrified. Which one of the following is correct?

Divergence of gold leaf is used to study

When a wooden sweater worm over a nylon shirt is removed, sparking is observed due to

A charge q placed at the centre of the line joining two equal charges Q. The system of three charges will be in equilibrium if q is equal to

The distance between two charges is increased by 25% then the percentage change in force is

Coulomb force between two charges kept at certain distance is F. If half of separation between them is filled with dielectric of constant [latex]\epsilon_r = 4[/latex], then the new coulomb’s force is

A polythene piece, rubbed with wool is found to have negative charge of [latex]4 \times 10^{-7}\ C[/latex]. The number of electrons transferred from wool to polythene is

Three charges each of [latex]+1\mu C[/latex] are placed at the corners of an equilateral triangle. If the force between any two charges be F, then, the net force on either charge will be

Bits of paper are attracted to an electrified comb, even though they have no net charge. How is this possible?

What do you mean by quantization of charge?

How can a body be charged with positive electricity by the method of induction? Explain.

Why metallic chain is used in the tanker transporting highly inflammable liquid?

Explain how a pitch ball can be electrified with positive or negative charge.

Can a charged body attract an uncharged body? Explain.

What is electrostatic shielding?

Why does bodies get electrified when they are rubbed together for a while?

How can a neutral body be charged with negative electricity by induction? Explain.

The tyres of airplane are made from a special rubber which is reasonably good conductor of electricity. What would be the reason behind it?

What do you understand by electrostatic induction? How can you charge a body positively by induction?

What is surface charge density at a point on the surface of a conductor? How does it depend on the shape of the conductor?

Define electrostatic induction. How do you charge a body negatively by induction?

State and explain coulomb’s law in electrostatics. Hence define one coulomb of charge from the coulomb’s law.

A glass rod is rubbed with silk and acquires a charge of magnitude 7.50 nC. What is the change in mass of the rod? Ans: [latex]42.6 \times 10^{-21}\ kg[/latex]

Calculate the value of two equal charges if they repel each other with a force of 0.1N when situated 50 cm apart in vacuum. What would be the distance between them if are placed in an insulating medium of dielectric constant 10? Ans: [latex]1.67 \times 10^{-4}\ C[/latex], 0.16m

Two-point charges are placed on the x-axis as follows:
Charge [latex]q_1 = +4nC[/latex] is located at x = 20 cm and charge [latex]q_2 = 5nC[/latex] is at x = 30 cm from the origin. Find the magnitude and direction of the total force experienced by the two charges in a negative point charge, [latex]q_3 = -6nC[/latex] placed at the origin. Ans: [latex]57 \times 10^{-5}\ N[/latex] along -ve x-axis

Three charges [latex]+5\mu C[/latex], [latex]+10\mu C[/latex] and [latex]-10\mu C[/latex] are placed in air at the corners A, B and C of an equilateral triangle ABC having each side equal to 5cm. Determine the resultant force on the charge at A.