The force between two charges 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become 

(1) 7.20 N

(2) 11.25 N

(3) 22.50 N

(4) 45.00 N

Concept Questions :-

Coulomb's law
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When 1019 electrons are removed from a neutral metal plate, the electric charge on it is 

(1) –1.6 C

(2) +1.6 C

(3) 10+19 C

(4) 10–19 C

Concept Questions :-

Ways of charging
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Two charges each equal to 2μC are 0.5m apart. If both of them exist inside vacuum, then the force between them is 

(1) 1.89 N

(2) 2.44 N

(3) 0.144 N

(4) 3.144 N

Concept Questions :-

Coulomb's law
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A solid conducting sphere of radius a has a net positive charge 2Q. A conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere and has a net charge –Q. The surface charge density on the inner and outer surfaces of the spherical shell will be 

(1) 2Q4πb2,Q4πc2

(2) Q4πb2,Q4πc2

(3) 0,Q4πc2

(4) None of the above

Concept Questions :-

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Three charges are placed at the vertices of an equilateral triangle of side ‘a’ as shown in the following figure. The force experienced by the charge placed at the vertex A in a direction normal to BC is 

(1) Q2/(4πε0a2)

(2) Q2/(4πε0a2)

(3) Zero

(4) Q2/(2πε0a2)

Concept Questions :-

Coulomb's law
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Two particles of equal mass m and charge q are placed at a distance of 16 cm. They do not experience any force. The value of qm is 

(1) l

(2) πε0G

(3) G4πε0

(4) 4πε0G

Concept Questions :-

Coulomb's law
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An electron is moving around the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force F on electron is (Where K=14πε0) 

(1) Ke2r3r^

(2) Ke2r3r

(3) Ke2r3r

(4) Ke2r2r^

Concept Questions :-

Coulomb's law
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Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4), and (4, 1) show electrostatic attraction, while pair (2, 3) and (4, 5) show repulsion. Therefore ball 1 must be 

(1) Positively charged

(2) Negatively charged

(3) Neutral

(4) Made of metal

Concept Questions :-

Coulomb's law
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Equal charges q are placed at the four corners A, B, C, D of a square of length a. The magnitude of the force on the charge at B will be 

(1) 3q24πε0a2

(2) 4q24πε0a2

(3) 1+222q24πε0a2

(4) 2+12q24πε0a2 

Concept Questions :-

Coulomb's law
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Two identical conductors of copper and aluminium are placed in an identical electric field. The magnitude of induced charge in the aluminum will be 

(1) Zero

(2) Greater than in copper

(3) Equal to that in copper

(4) Less than in copper

Concept Questions :-

Electric field
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