The dielectric constant of pure water is 81. Its permittivity will be 

(1) 7.17 × 10–10 MKS units

(2) 8.86 × 10–12 MKS units

(3) 1.02 × 1013 MKS units

(4) Cannot be calculated

Concept Questions :-

Coulomb's law
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Force of attraction between two point charges Q and – Q separated by d meter is Fe. When these charges are placed on two identical spheres of radius R = 0.3 d whose centres are d meter apart, the force of attraction between them is 

(1) Greater than Fe

(2) Equal to Fe

(3) Less than Fe

(4) Less than Fe

Concept Questions :-

Coulomb's law
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One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of is given equal amount of negative charge. Then 

(1) Mass of A and mass of B is the same

(2) Mass of A is more

(3) Mass of B is less

(4) Mass of B is more

Concept Questions :-

Ways of charging
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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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