Why is it safer to be inside a car than standing under a tree during lightning?

Define electric potential difference between two points ?

Give the unit and dimensions of electric potential

If " W  " is the work done to bring a charge " q " from infinity to a point then what is the electric potential at that point ?

What do you meant by electric potential at a point ?

What is meant by equipotential surface?

Inside a hollow charged spherical conductor, the potential

A) Is constant

B) Varies directly as the distance from the centre

C) Varies inversely as the distance from the centre

D) Varies inversely as the square of the distance from the centre

Two electrons are held 3μm apart. When released from rest, what is the velocity of each electron when they are 8μm apart?

The distance AB between charges Q1 and Q2 shown below is 5.0 m. How much work must be done to move charge Q2 to a new location at point C so that the distance BC = 2.5 m?

Draw the equipotential surface for two like charges separated by a small distance ?

Draw the equipotential surface for a point charge?

Write the expression for the potential at a point on the surface of

i) the inner sphere and

ii) the outer sphere.

a) What is the use of van de Graff generator?

b) States the principle of van de Graff generator?

c) Explain its working with a neat diagram ?

State the principle/s of van de Graff generator?

An electric dipole is placed in a uniform electric field at an angle θ with the field E.

a) What happens to the dipole

b) Obtain the expression for energy of the above system.

c) Give the conditions for stable and unstable equilibrium of the dipole system.

N identical and equally charged (q) liquid drops coleases to form a single big drop .What is the charge and capacitance of the big drop. ?

a)Define electric polarization and give its unit ?

b)Writes the relation between polarization and electric field ?

The work done to move half a revolution of electron in an Orbit is zero. Why?

Prove that electric field is always perpendicular to an equipotential surface.

Work done to move a charge q from one point to another point on an equipotential is zero.

a)What do you meant by energy of a system of three charges ?

b)obtain the expression for the potential energy of the above system of charges?

a)What do you meant by energy of a system of two charges ?

b)obtain the expression for the potential energy of a system of two charges?

what are the different methods to increase the capacitance of a parallel plate capacitor.

a)What is the use of a capacitor ?

b)Obtain the expression for the capacitance of a parallel plate capacitor ?

c)What are the methods to increase the capacitance of a parallel plate capacitor ?

When a dielectric slab is introduced between the plates of a capacitor what happens to its capacitance ?

When a dielectric is introduced between the plates of a charged but source less parallel plates capacitor then what happens to the electric field between the plates ?

Define one Farad ?

^{What is the work done by the field of a nucleus in a complete circular orbit of the electron? What if the orbit is elliptical?Justify your answer.}

^{In a Van de Graaff type generator a spherical metal shell is to be a 15 × 106 V . The dielectric strength of the gas surrounding the electrode is 5 × 107 Vm−1. What is the minimum radius of the spherical shell required?}

Describe schematically the equipotential surfaces corresponding to

(a) a single positive charge at the origin, and

(b) a uniform grid consisting of long equally spaced parallel charged wires in a plane.

Describe schematically the equipotential surfaces corresponding to

(a) a constant electric field in the z-direction,

(b) a field that uniformly increases in magnitude but remains in a constant (say, z) direction,

A bird perches on a bare high power line, and nothing happensto the bird. A man standing on the ground touches the same line and gets a fatal shock. Why?

A comb run through one’s dry hair attracts small bits of paper.Why? What happens if the hair is wet or if it is a rainy day?

Vehicles carrying inflammable materials usually have metallic ropes touching the ground during motion. Why?

Give the sign of the potential energy difference of a small negative charge between the points A and B ?

_{Give the sign of the potential energy difference of a small negative charge between the points Q and P ?}

A molecule of a substance has a permanent electric dipole moment of magnitude 10^–29 C m. A mole of this substance is polarised (at low temperature) by applying a strong electrostatic field of magnitude 10⁶ V m^–1. The direction of the field is suddenly changed by an angle of 60º. Estimate the heat released by the substance in aligning its dipoles along the new direction of the field. For simplicity, assume 100% polarisation of the sample.?