Force between two point charges \( q_1 \) and \( q_2 \) placed in vacuum at a distance \( r \, \text{cm} \) apart is \( F \). Force between them when placed in a medium having dielectric \( K = 5 \) at \( r/5 \, \text{cm} \) apart will be:
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When charges are placed in a medium, always account for the dielectric constant \( K \) and any change in the distance between the charges. Both factors influence the resultant force.