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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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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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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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

Concept Questions :-

Coulomb's law
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A soap bubble is given a negative charge, then its radius 

(1) Decreases

(2) Increases

(3) Remains unchanged

(4) Nothing can be predicted as information is insufficient

Concept Questions :-

Coulomb's law
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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

Concept Questions :-

Coulomb's law
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A total charge Q is broken in two parts Q1 and Q2 and they are placed at a distance R from each other. The maximum force of repulsion between them will occur, when 

(1) Q2=QR,Q1=QQR

(2) Q2=Q4,Q1=Q2Q3

(3) Q2=Q4,Q1=3Q4

(4) Q1=Q2,Q2=Q2  

Concept Questions :-

Coulomb's law
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Three charges 4q, Q, and q are in a straight line in the position of 0, l/2, and l respectively. The resultant force on q will be zero if Q = 

(1) – q

(2) –2q

(3) q2

(4) 4q

Concept Questions :-

Coulomb's law
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Two small spheres each having the charge +Q are suspended by insulating threads of length L from a hook. This arrangement is taken in space where there is no gravitational effect, then the angle between the two suspensions and the tension in each will be 

(1) 180o,14πε0Q2(2L)2

(2) 90o,14πε0Q2L2

(3) 180o,14πε0Q22L2

(4) 180o,14πε0Q2L2 

Concept Questions :-

Coulomb's law
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Difficulty Level: