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 |
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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
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. | \(Q_1=\frac{Q}{2}, Q_2=\frac{Q}{2}\) |
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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 |
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Two charges 2 and 8 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 . |
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The acceleration of an electron due to the mutual attraction between the electron and a proton when they are \(1.6~\mathring{A}\) apart is:
( \(\frac{1}{4 \pi \varepsilon_0}=9 \times 10^9~ \text{Nm}^2 \text{C}^{-2}\) )
1. | \( 10^{24} ~\text{m/s}^2\) | 2 | \( 10^{23} ~\text{m/s}^2\) |
3. | \( 10^{22}~\text{m/s}^2\) | 4. | \( 10^{25} ~\text{m/s}^2\) |
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Four charges are arranged at the corners of a square ABCD as shown in the figure. The force on a positive charge kept at the center of the square is:
1. | Zero |
2. | Along diagonal AC |
3. | Along diagonal BD |
4. | Perpendicular to the side AB |
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Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4), and (4, 1) show electrostatic attraction, while pairs (2, 3) and (4, 5) show repulsion. Therefore ball 1 must be:
1. positively charged.
2. negatively charged.
3. neutral.
4. made of metal.
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Three charges are placed at the vertices of an equilateral triangle of side \(a\) as shown in the following figure. The force experienced by the charge placed at the vertex A in a direction normal to BC is:
1.
2.
3. zero
4.
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Two small spheres each having the charge +Q are suspended by insulating threads of length L from a hook. If this arrangement is taken in space where there is no gravitational effect, then the angle between the two suspensions and the tension in each will be:
1.
2.
3.
4.
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