Q164 / 180 · COMEDK 2017 · Physics

The work done in carrying a charge $q$ once round a circle of radius $r$ with a charge $Q$ at the centre is

  • A
    $\frac{q Q}{4 \pi \varepsilon_{0} r}$
  • B
    $\frac{q Q}{4 \pi \varepsilon_{0}^{2} r^{2}}$
  • C
    $\frac{q Q}{4 \pi \varepsilon_{0} r^{2}}$
  • Correct answer
    D
    None of these

Solution

According to given situation of charges, electrostatic force works which is conservative in nature i.e., work done depends on initial and final position only. Here, initial and final position coincide, hence work done will be zero.

Hence, the correct answer is option: 'D'.

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