Two identical point charges placed at a separation in air experience a force
PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
Two identical point charges q placed at a separation r in air experience a force F.
If each charge is increased to 3q, the separation is increased to 2r, and the arrangement is now immersed in a medium of relative permittivity εr=5, find the new force in terms of F.