Two small spheres attract each other with a force of when they are apart

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Two small spheres attract each other with a force of

20\,\text{N}

when they are

0.50\,\text{m}

apart. Keeping their masses unchanged, determine the force when the distance is reduced to

0.25\,\text{m}