The charge on 500 cc of water due to protons will be: 

1. 6.0 × 1027 C 2. 2.67 × 107 C
3. 6 × 1023 C 4. 1.67 × 1023 C
Subtopic:  Electric Charge |
 59%
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A polythene piece rubbed with wool is found to have a negative charge of 3×10-7 C. Transfer of mass from wool to polythene is:
1. 0.7 × 10 - 18   kg
2. 1.7 × 10 - 17   kg
3. 0.7 × 10 - 17   kg
4. 1.7 × 10 - 18   kg

Subtopic:  Electric Charge |
 59%
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A total charge \(Q\) is broken in two parts \(Q_1\) and \(Q_2\) and they are placed at a distance \(R\) from each other. The maximum force of repulsion between them will occur, when:

1. \(Q_2=\frac{Q}{R}, Q_1=Q-\frac{Q}{R}\)            
2. \(Q_2=\frac{Q}{4}, Q_1=Q-\frac{2 Q}{3}\)            
3. \(Q_2=\frac{Q}{4}, Q_1=\frac{3 Q}{4}\)            
4. \(Q_1=\frac{Q}{2}, Q_2=\frac{Q}{2}\)            

Subtopic:  Coulomb's Law |
 85%
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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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Two charges 2 μC and 8 μC are separated by 6 cm. The neutral point is at:

1. 4 cm from 2  μC.
2. 2 cm from 2  μC .
3. 2 cm from 8  μC .
4. 3 cm from 8  μC .

Subtopic:  Coulomb's Law |
 78%
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The acceleration of an electron due to the mutual attraction between the electron and a proton when they are \(1.6~\mathring{\mathrm{A}}\) apart is:
\(\frac{1}{4 \pi \varepsilon_0}=9 \times 10^9~ \mathrm{Nm}^2 \mathrm{C}^{-2}\) )

1. \( 10^{24} \mathrm{~m} / \mathrm{s}^2 \) 2 \( 10^{23} \mathrm{~m} / \mathrm{s}^2 \)
3. \( 10^{22} \mathrm{~m} / \mathrm{s}^2 \) 4. \( 10^{25} \mathrm{~m} / \mathrm{s}^2\)
Subtopic:  Coulomb's Law |
 75%
From NCERT
NEET - 2020
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Four charges are arranged at the corners of a square ABCD as shown in the figure. The force on a positive charge kept at the center of the square is:

         

1. Zero
2. Along diagonal AC
3. Along diagonal BD
4. Perpendicular to the side AB

Subtopic:  Coulomb's Law |
 68%
From NCERT
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Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4), and (4, 1) show electrostatic attraction, while pairs (2, 3) and (4, 5) show repulsion. Therefore ball 1 must be:

1. positively charged.

2. negatively charged.

3. neutral.

4. made of metal.

Subtopic:  Coulomb's Law |
 68%
From NCERT
PMT - 2003
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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)

Subtopic:  Coulomb's Law |
 64%
From NCERT
AIIMS - 2003
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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. 180o, 14πε0Q2(2L)2

2. 90o, 14πε0Q2L2

3. 180o, 14πε0Q22L2

4. 180o, 14πε0Q2L2 

Subtopic:  Coulomb's Law |
 68%
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