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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 . 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 $\mathrm{\mu C}$ and 8 $\mathrm{\mu C}$ 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. $\frac{4\pi {\epsilon }_{0}F{d}^{2}}{{e}^{2}}$

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 |
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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