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The charge on 500 *cc* of water due to protons will be:

1. | 6.0 × 10^{27} C |
2. | 2.67 × 10^{7} C |

3. | 6 × 10^{23} C |
4. | 1.67 × 10^{23} C |

Subtopic: Electric Charge |

58%

From NCERT

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A polythene piece rubbed with wool is found to have a negative charge of $3\times {10}^{-7}C$. 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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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 |

84%

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 |

77%

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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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. | \( 10^{25} ~\text{m/s}^2\) |

Subtopic: Coulomb's Law |

75%

From NCERT

NEET - 2020

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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 |

Subtopic: Coulomb's Law |

67%

From NCERT

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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.

Subtopic: Coulomb's Law |

67%

From NCERT

PMT - 2003

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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. ${Q}^{2}/\left(4\pi {\epsilon}_{0}{a}^{2}\right)$

2. $-{Q}^{2}/\left(4\pi {\epsilon}_{0}{a}^{2}\right)$

3. zero

4. ${Q}^{2}/\left(2\pi {\epsilon}_{0}{a}^{2}\right)$

Subtopic: Coulomb's Law |

64%

From NCERT

AIIMS - 2003

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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. ${180}^{o},$ $\frac{1}{4\pi {\epsilon}_{0}}\frac{{Q}^{2}}{{\left(2L\right)}^{2}}$

2. ${90}^{o},$ $\frac{1}{4\pi {\epsilon}_{0}}\frac{{Q}^{2}}{{L}^{2}}$

3. ${180}^{o},$ $\frac{1}{4\pi {\epsilon}_{0}}\frac{{Q}^{2}}{2{L}^{2}}$

4. ${180}^{o},$ $\frac{1}{4\pi {\epsilon}_{0}}\frac{{Q}^{2}}{{L}^{2}}$

Subtopic: Coulomb's Law |

68%

From NCERT

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