A small bead of mass carries a charge of

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A small bead of mass

2.0\times10^{-5}\,\text{kg}

carries a charge of

-1.5\,\mu\text{C}

. It is held at rest on a vertical line

0.050\,\text{m}

below a fixed point charge of

+4.0\,\mu\text{C}

, then released. Ignoring air resistance, what is the magnitude of the bead’s initial acceleration? (a)

1.1\times10^{5}\,\text{m/s}^2

(b)

5.4\times10^{4}\,\text{m/s}^2

(c)

1.1\times10^{6}\,\text{m/s}^2

(d)

1.1\times10^{4}\,\text{m/s}^2