When \(10^{19}\) electrons are removed from a neutral metal plate, the electric charge on it is? 

1. \(-1.6\) C 2. \(+1.6\) C
3. \(10^{19}\) C 4. \(10^{-19}\) C
Subtopic:  Electric Charge |
 70%
From NCERT
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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%
From NCERT
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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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If \(10^9\) electrons move out of a body to another body every second, how much time approximately is required to get a total charge of \(1\)on the other body?
1. \(200\) years
2. \(100\) years
3. \(150\) years
4. \(250\) years

Subtopic:  Electric Charge |
 56%
From NCERT
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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%
From NCERT
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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%
From NCERT
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Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, the number of electrons missing from each ion will be:
(e is the charge on an electron)

1. 4πε0Fd2e2

2. 4πε0Fd2d2

3. 4πε0Fd2e2

4. 4πε0Fd2q2

Subtopic:  Coulomb's Law |
 77%
From NCERT
AIPMT - 2010
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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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Two point charges \(A\) and \(B\), having charges \(+Q\) and \(-Q\) respectively, are placed at a certain distance apart and the force acting between them is \(F.\) If \(25\)% charge of \(A\) is transferred to \(B\), then the force between the charges becomes:
1. \(\frac{4F}{3}\)
2. \(F\)
3. \(\frac{9F}{16}\)
4. \(\frac{16F}{9}\)

Subtopic:  Coulomb's Law |
 75%
From NCERT
NEET - 2019
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