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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Given below are two statements: 

Assertion (A): When charges are shared between any two bodies, no charge is really lost but some loss of energy does occur.
Reason (R): Some energy disappears in the form of heat, sparking, etc.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
Subtopic:  Electric Charge |
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%
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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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