1. | \(9 \times 10^{-3}~\text{J}\) | 2. | \(9 \times 10^{-3}~\text{eV}\) |
3. | \(2~\text{eV/m}\) | 4. | zero |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThree 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. | \(\text{zero}\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTwo 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. | \(6q_1\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology