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Paragraph: A particle of charge q and mass m is clamped rigidly at the circumference of a ring with mass m and radius R . Initially ring is in vertical plane resting on a sufficiently rough horizontal surface with charge q at the same horizontal level as that of the centre of the ring. There exists uniform horizontal electric fields as shown. At t =0 the system is let free. (Given that qE = mg , = 22 7 ) Question: Sp

Options

  1. A11 28 Rg
  2. B2 28 Rg
  3. C4 28 Rg
  4. D11 56 Rg

Correct answer

A. 11 28 Rg

Step-by-step solution

At t =0 ; qE + f =2 ma ; mgR + qER = I _ A = I _ A a R ; mg + qE = ( mR ^2+ mR ^2+2 mR ^2 ) a R ^2 qE = mg , so a = g 2 f =2 ma - qE =2 ~m ~g 2 - mg =0

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