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​A wheel having mass m has charges + q and - q on diametrically opposite points. It remains in equilibrium on a rough inclined plane in the presence of a uniform vertical electric field E . The value of E is

Options

  1. Am g q
  2. Bm g 2 q
  3. Cm g tan θ 2 q
  4. Dnone

Correct answer

B. m g 2 q

Step-by-step solution

For rotational equilibrium, ∑ τ P = 0 ⇒ m g a cos α – q E ( 2 a cos ) = 0 ⇒ E = m g 2 q

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