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The force on a point charge $+q$ kept at a distance $d$ from the surface of an infinite grounded metal plate in a medium of permittivity  $\epsilon\:$ is

  1. $0$
  2. $\dfrac{q^{2}}{16\pi \epsilon d^{2}}$ away from the plate
  3. $\dfrac{q^{2}}{16\pi \epsilon d^{2}}$ towards the plate
  4. $\dfrac{q^{2}}{4\pi \epsilon d^{2}}$ towards the plate
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