When 1019 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 |
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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 |
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A polythene piece rubbed with wool is found to have a negative charge of . 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 |
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If 109 electrons move out of a body to another body every second, how much time approximately is required to get a total charge of 1 C on the other body?

1. 200 years

2. 100 years

3. 150 years

4. 250 years

Subtopic:  Electric Charge |
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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. ${Q}_{2}=\frac{Q}{R},\text{\hspace{0.17em}}{Q}_{1}=Q-\frac{Q}{R}$

2. ${Q}_{2}=\frac{Q}{4},\text{\hspace{0.17em}}{Q}_{1}=Q-\frac{2Q}{3}$

3. ${Q}_{2}=\frac{Q}{4},\text{\hspace{0.17em}}{Q}_{1}=\frac{3Q}{4}$

4. ${Q}_{1}=\frac{Q}{2},\text{\hspace{0.17em}}{Q}_{2}=\frac{Q}{2}$

Subtopic:  Coulomb's Law |
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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 (Attractive)

2. 4 N (Repulsive)

3. 8 N (Repulsive)

4. Zero

Subtopic:  Coulomb's Law |
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Two charges 2 $\mathrm{\mu C}$ and 8 $\mathrm{\mu C}$ are separated by 6 cm. The neutral point is at:

1.  4 cm from 2 $\mathrm{\mu C}$.

2.  2 cm from 2 $\mathrm{\mu C}$.

3.  2 cm from 8 $\mathrm{\mu C}$.

4.  3 cm from 8 $\mathrm{\mu C}$.

Subtopic:  Coulomb's Law |
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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. $\frac{4\pi {\epsilon }_{0}F{d}^{2}}{{e}^{2}}$

2. $\sqrt{\frac{4\pi {\epsilon }_{0}F{d}^{2}}{{d}^{2}}}$

3. $\sqrt{\frac{4\pi {\epsilon }_{0}F{d}^{2}}{{e}^{2}}}$

4. $\frac{4\pi {\epsilon }_{0}F{d}^{2}}{{q}^{2}}$

Subtopic:  Coulomb's Law |
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The acceleration of an electron due to the mutual attraction between the electron and a proton when they are  apart is:

1.

2.

3.

4.

Subtopic:  Coulomb's Law |
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Two point charges A and B, having charges +Q and -Q respectively, are placed at 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 |
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