Physics

Problem

Four pairs of identical small spheres carry the charges and separations listed below. Neglecting all other interactions, which pair experiences the greatest magnitude of electrostatic force? I.

+2\,\mu\text{C}

and

+2\,\mu\text{C}

separated by

2\,\text{cm}

II.

+4\,\mu\text{C}

and

+1\,\mu\text{C}

separated by

1\,\text{cm}

III.

+3\,\mu\text{C}

and

+3\,\mu\text{C}

separated by

3\,\text{cm}

IV.

+5\,\mu\text{C}

and

+2\,\mu\text{C}

separated by

5\,\text{cm}

a) I b) IV c) II d) III

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