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Two point charges +q and -q are fixed on diametrically opposite point on the uniform ring, such that -q is at bottom and is in contact with a perfect insulator incline plane. Total mass is equal to m . It remains in equilibrium on the rough inclined plane in the presence of uniform vertical electric field E . Then

Options

  1. Athe value of friction force is mg .
  2. Bthe value of friction force is less than mg .
  3. Cthe value of electric field is mg 2 q .
  4. Dthe value of electric field is m g 2 q .

Correct answer

C. the value of electric field is mg 2 q .

Step-by-step solution

f=m g and P E =m g . R q 2 R E =m g R E = mg 2 q Ans. ( 1 ) &( 3 )

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