Electrostatics Physics - Electrostatics

A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will be

Which of the following is not a property of equipotential surfaces?

Van de Graaff generator producers large electrostatic potential difference of the order of …………………

The principle made use of lightning arrestor is …………………

The charge density in maximum at …………………

A capacitor is a device to store …………………

The process of isolating a certain region of space from the external field is called …………………

What is a capacitor?

What are polar molecules? Give examples.

What are non-polar molecules? Give examples.

What is meant by dielectric?

What is meant by electrostatic shielding?

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but the reason is not correct explanation of the assertion.
(c) If the assertion is true but the reason is false.
(d) If the assertion and reason both are false.
(e) If the assertion is false but the reason is true.
Assertion: The lightning conductor at the top of a high building has sharp ends.
Reason: The surface density of charge at sharp points is very high, resulting in the setting up of electric wind.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but the reason is not correct explanation of the assertion.
(c) If the assertion is true but the reason is false.
(d) If the assertion and reason both are false.
(e) If the assertion is false but the reason is true.
Assertion: The tyre’s of aircraft are slightly conducting.
Reason: If a conductor is connected to the ground, the extra charge induced on the conductor will flow to the ground.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but the reason is not correct explanation of the assertion.
(c) If the assertion is true but the reason is false.
(d) If the assertion and reason both are false.
(e) If the assertion is false but the reason is true.
Assertion:
A point charge is brought in an electric field. The field at a nearby point will increase, whatever be the nature of the charge.
Reason: The electric field is independent of the nature of the charge.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but the reason is not correct explanation of the assertion.
(c) If the assertion is true but the reason is false.
(d) If the assertion and reason both are false.
(e) If the assertion is false but the reason is true.
Assertion: Charge is quantized.
Reason: Charge, which is less than 1 C is not possible.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but the reason is not correct explanation of the assertion.
(c) If the assertion is true but the reason is false.
(d) If the assertion and reason both are false.
(e) If the assertion is false but the reason is true.
Assertion: Electric lines of force cross each other.
Reason: Electric field at a point superimposed to give one resultant electric field.

Find the force of attraction between the plates of a parallel plate capacitor.

Two particles having charges Q1 and Q2 when kept at a certain distance, exert a force F on each other. If the distance between the two particles is reduced to half and the charge on each particle is doubled. Find the force between the particles.

Small mercury drops of the same size are charged to the same potential V. If n such drops coalesce to form a single large drop, then calculate its potential.

Electrons are caused to fall through a potential difference of 1500 volts. If they were initially at rest. Then calculate their final speed.

Derive an expression for the electric flux of rectangular area placed in a uniform electric field.

Derive an expression for the electric field due to the system of point charges?