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Electrostatics – 1 – 3

11. When the distance between two charged particles is halved the coulomb force between them becomes :

(a) one fourth of the initial force
(b) four times the initial force
(c) double the initial force
(d) one-half of the initial force

Answer
Answer : (b)

Explanation
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12. If two charges each of one coulomb are separated by a distance 1 metre, than the force between them is approximately :

(a) 2.2 newton
(b) 8.85 × 1012 newton
(c) 1.6 × 1019 newton
(d) 9 × 109 newton

Answer
Answer : (d)

Explanation
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13. According to Gauss Law, ∫E. ds = 

(a) q = ɛ0
(b) q / ɛ0
(c) ɛ0
(d) none of these

Answer
Answer : (b)

Explanation
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14. Gauss’s law can be applied to :

(a) Plane surface
(b) Curved surface
(c) Any surface
(d) Closed surface

Answer
Answer : (d)

Explanation
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15. Coulomb is that charge which when placed in free space at a distance of 1 m form an equal and similar charge repels it with a force of :

(a) 1/8 πɛ02
(b) 8 πɛ0
(c) 1/4 πɛ0
(d) 1/4 πɛ02

Answer
Answer : (c)

Explanation
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