Physics

Problem

A small neutral conducting sphere of radius

1.0\,\text{cm}

is located

5.0\,\text{cm}

from a point charge of

+8.0\,\mu\text{C}

. The attractive force between them varies approximately as

1/r^{2}

with their center-to-center separation

r

. If the separation is reduced to

2.5\,\text{cm}

, by what factor does the magnitude of the force change? a)

2

8

1

(no change) d)

4