MHT CET · Physics · Electrostatics
Three charges Q, (-2q) and (-2q) are placed at the vertices of an isosceles right angled triangle as shown in figure. The net electrostatic potential energy is zero if Q is equal to
- A \(\sqrt{2} \mathrm{q}\)
- B \(\frac{q}{2}\)
- C \(\frac{\mathrm{q}}{\sqrt{2}}\)
- D \(\frac{q}{2 \sqrt{2}}\)
Answer & Solution
Correct Answer
(C) \(\frac{\mathrm{q}}{\sqrt{2}}\)
Step-by-step Solution
Detailed explanation
\(U_{net} = U_{12} + U_{13} + U_{23}\) \(U_{net} = \frac{kQ(-2q)}{a} + \frac{kQ(-2q)}{a} + \frac{k(-2q)(-2q)}{\sqrt{a^2+a^2}}\)
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