COMEDK · Physics · 17. Electrostatics

A particle ' \(X\) ' carrying a charge \(+Q\) is moving in a circular path of radius \(R\) around another particle ' \(Y\) ' having a charge \(-Q\) with a frequency ' \(v\) '. Then the mass ' \(m\) ' of the charged particle is

A \(M=\dfrac{Q^2}{\left[16 \pi^3 \varepsilon_0 R^2 v^2\right]}\)
B \(M=\dfrac{Q^2}{\left[16 \pi^2 \varepsilon_0 R v^2\right]}\)
C \(M=\dfrac{Q^2}{\left[16 \pi^2 \varepsilon_0 R^3 v^2\right]}\)
D \(M=\dfrac{Q^2}{\left[16 \pi^3 \varepsilon_0 R^3 v^2\right]}\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(M=\dfrac{Q^2}{\left[16 \pi^3 \varepsilon_0 R^3 v^2\right]}\)

Step-by-step Solution

Detailed explanation

The electrostatic force between the two charges \(Q\) and \(-Q\) separated by a distance \(R\) provides the necessary centripetal force for the circular motion of particle \(X\). The electrostatic force is given by Coulomb's law as…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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