An electric dipole is in unstable equilibrium in the uniform electric field. The angle between its dipole moment and the electric field is
1. 90
2. 120
3. 0
4. 180
Difficulty Level:
A particle having charge exerts F electrostatic force on charge at rest. If a particle having charge is placed midway between the line joining the two charges then electrostatic force on due to will become/remain
1. 2F
2.
3. F
4. zero
Difficulty Level:
A charge q is to be divided on two small conducting spheres. What should be the value of charges on the spheres so that when placed at a certain distance apart, the repulsion force between them is maximum
(1)
(2)
(3)
(4)
Difficulty Level:
You are traveling in a car during a thunderstorm. In order to protect yourself from lightning, you would prefer to
(1) Touch the nearest electric pole
(2) Take shelter under a tree
(3) Get out and crouch on the ground
(4) Remain in the car
Difficulty Level:
If a soap bubble is given some charge, then its radius
(1) Increases
(2) Decreases
(3) Remain unchanged
(4) May increase or decrease depending upon the give charge is positive or negative
Difficulty Level:
An electric dipole of dipole moment p is placed in an electric field of intensity E such that angle between electric field and dipole moment is . Assuming that the potential energy of the dipole is zero when , the potential energy of the dipole will be
(1) -pE cos
(2) pE(1-cos)
(3) pE(cos-1)
(4) -2pE(cos-1)
Difficulty Level:
The electrostatic field due to a charged conductor just outside the conductor is
1. zero and parallel to the surface at every point inside the conductor
2. zero and is normal to the surface at every point inside the conductor
3. parallel to the surface at every point and zero inside the conductor
4. normal to the surface at every point and zero inside the conductor
Difficulty Level:
The law, governing the force between electric charges is known as
(1) Ampere's law
(2) Ohm's law
(3) Faraday's law
(4) Coulomb's law
Difficulty Level:
Fg and Fe represents gravitational and electrostatic force respectively between electrons situated at a distance 10 cm. The ratio of Fg/ Fe is of the order of
(1) 1042
(2) 10
(3) 1
(4) 10–43
Difficulty Level:
Four charges are arranged at the corners of a square ABCD, as shown in the adjoining figure. The force on the charge kept at the centre O is
(1) Zero
(2) Along the diagonal AC
(3) Along the diagonal BD
(4) Perpendicular to side AB
Difficulty Level: