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A given charge situated at a distance r from an electric dipole on its axis experience a force f. If the distance of the charge from the dipole is doubled, the force acting on the charge will be

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RPSC 2nd Grade Science - 2015 Official Paper
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  1. 4f
  2. f/8
  3. f/4
  4. f/2

Answer (Detailed Solution Below)

Option 2 : f/8
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Detailed Solution

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Concept:

The magnitude of the electric force experienced by a charge q, placed at a distance r from the dipole will be

⇒ F = qE

The electric field E due to dipole on its axis is given by:

∴ 

or 

Calculation:

Given:

F1 = f, r1 = r, r2 = 2r

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