A particle having charge q1 exerts F electrostatic force on charge q2 at rest. If a particle having charge q14 is placed midway between the line joining the two charges q1andq2 then electrostatic force on q2 due to q1 will become/remain

1. 2F

2. F2

3. F

4. zero

 

Subtopic:  Coulomb's Law |
 66%
From NCERT
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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 repulsive force between them is maximum?

1. q4and3q4

2. q2andq2

3. q3andq3

4. q4andq4

Subtopic:  Coulomb's Law |
 81%
From NCERT
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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

Subtopic:  Coulomb's Law |
 93%
From NCERT
PMT - 1972
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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

Subtopic:  Coulomb's Law |
 54%
From NCERT
PMT - 1978
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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 positive charge \(Q\) kept at the centre \(O\) is:

       

1. Zero 2. Along the diagonal \(AC\)
3. Along the diagonal \(BD\) 4. Perpendicular to side \(AB\)
Subtopic:  Coulomb's Law |
 65%
From NCERT
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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

Subtopic:  Coulomb's Law |
From NCERT
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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 \(Q\) equal to:
1. \(-q\)
2. \(-2q\)
3. \(\frac{-q}{2}\)
4. \(4q\)

Subtopic:  Coulomb's Law |
 64%
From NCERT
PMT - 1980
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Two small spheres each having the charge \(+Q\) are suspended by insulating threads of length \(L\) from a hook. If 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. \(180^\circ,\) \(\frac{1}{4 \pi \epsilon_{0}} \frac{Q^{2}}{(2 L )^{2}}\)

2. \(90^\circ,\) \(\frac{1}{4 \pi \epsilon_{0}} \frac{Q^{2}}{(L )^{2}}\)

3. \(180^\circ,\) \(\frac{1}{4 \pi \epsilon_{0}} \frac{Q^{2}}{2 L ^{2}}\)

4. \(180^\circ,\) \(\frac{1}{4 \pi \epsilon_{0}} \frac{Q^{2}}{ L ^{2}}\) 

Subtopic:  Coulomb's Law |
 69%
From NCERT
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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

Subtopic:  Coulomb's Law |
 83%
From NCERT
PMT - 1977
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Two charges \(+2\) C and \(+6\) C are repelling each other with a force of \(12\) N. If each charge is given \(-2\) C of charge, then the value of the force will be:

1. \(4\) N (attractive) 2. \(4\) N (repulsive)
3. \(8\) N (repulsive) 4. zero
Subtopic:  Coulomb's Law |
 78%
From NCERT
PMT - 1979
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