- 1(current)
Q. No.What is the potential energy of two equal positive point charges of \(1~ \mu \text{C}\) each held \(1~\text m\) apart in the air?
| 1. | \(9 \times 10^{-3}~\text{J}\) | 2. | \(9 \times 10^{-3}~\text{eV}\) |
| 3. | \(2~\text{eV/m}\) | 4. | zero |
Subtopic: Â Electric Potential Energy |
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Level 2: 60%+
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Three charges \(Q\), \(+q \) and \(+q \) are placed at the vertices of an equilateral triangle of side \(l\) as shown in the figure. If the net electrostatic energy of the system is zero, then \(Q\) is equal to:
| 1. | \(-\frac{q}{2} \) | 2. | \(-q\) |
| 3. | \(+q\) | 4. | \(\text{zero}\) |
Subtopic: Â Electric Potential Energy |
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Level 2: 60%+
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Two charges \(q_1\) and \(q_2\) are placed \(30~\text{cm}\) apart, as shown in the figure. A third charge \(q_3\) is moved along the arc of a circle of radius \(40~\text{cm}\) from \(C\) to \(D.\) The change in the potential energy of the system is \(\dfrac{q_{3}}{4 \pi \varepsilon_{0}} k,\) where \(k\) is:
| 1. | \(8q_2\) | 2. | \(8q_1\) |
| 3 | \(6q_2\) | 4. | \(6q_1\) |
Subtopic: Â Electric Potential Energy |
 67%
Level 2: 60%+
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- 1(current)
Q. No.
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