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 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 |
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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. Q2=QR,Q1=QQR

2. Q2=Q4,Q1=Q2Q3

3. Q2=Q4,Q1=3Q4

4. Q1=Q2,Q2=Q2  

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 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 |
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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 |
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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 Ao apart is:

(me 9×10-31 kg, e=1.6×10-19 C)

(Take 14πε0 = 9×109 Nm2C-2)

1.  1024 m/s2

2.  1023 m/s2

3.  1022 m/s2

4.  1025 m/s2

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. 4F3

2. F

3. 9F16

4. 16F9

Subtopic:  Coulomb's Law |
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