Out of gravitational, electromagnetic, Vander Waals, electrostatic and nuclear forces; which two are able to provide an attractive force between two neutrons 

(1) Electrostatic and gravitational

(2) Electrostatic and nuclear

(3) Gravitational and nuclear

(4) Some other forces like Vander Waals

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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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Two charges each of 1 coulomb are at a distance 1 km apart, the force between them is 

(1) 9 × 103 Newton

(2) 9 × 10–3 Newton

(3) 1.1 × 10–4 Newton

(4) 104 Newton

Concept Questions :-

Coulomb's law
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+2C and +6C two charges are repelling each other with a force of 12 N. If each charge is given –2C of charge, then the value of the force will be 

(1) 4 N (Attractive)

(2) 4 N (Repulsive)

(3) 8 N (Repulsive)

(4) Zero

Concept Questions :-

Coulomb's law
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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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