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°

Concept Questions :-

Electric dipole
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A particle of mass m and charge q is at rest. If it is moved with velocity 3c2 where c is speed of light in vacuum, then its charge will become/remain

(1) 2q

(2) 3q

(3) q2

(4) q

Concept Questions :-

Ways of charging
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A particle having charge q1 exerts F electrostatic force on charge q2 at rest. If a particle having charge q14 is placed midway between the line joining the two charges q1 and q2 then electrostatic force on q2 due to q1 will become/remain

1. 2F

2. F2

3. F

4. zero

 

Concept Questions :-

Coulomb's law
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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) q4 and 3q4

(2) q2 and q2

(3) q3 and q3

(4) q4 and q4

Concept Questions :-

Coulomb's law
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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

Concept Questions :-

Electric field
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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

Concept Questions :-

Coulomb's law
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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 θ. Assuming that the potential energy of the dipole is zero when θ=0°, the potential energy of the dipole will be

(1) -pE cosθ

(2) pE(1-cosθ)

(3) pE(cosθ-1)

(4) -2pE(cosθ-1)

Concept Questions :-

Electric dipole
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What is the angle between the electric dipole moment and the electric field strength due to it on the equatorial line

(1) 0°

(2) 90°

(3) 180°

(4) None of these

Concept Questions :-

Electric dipole
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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

 

Concept Questions :-

Electric field
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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

Concept Questions :-

Coulomb's law
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