Mathematics

Problem

A long vertical wire carries a current of

8\,\text{A}

upward. A short straight conductor

PQ

of length

0.20\,\text{m}

is placed

0.05\,\text{m}

east of this wire. The conductor lies along the east–west direction and carries

3\,\text{A}

of current from west to east. Neglecting end effects, select the correct magnitude and direction of the force acting on

PQ

. a)

1.9\times10^{-5}\,\text{N}

, downward b)

3.8\times10^{-5}\,\text{N}

, upward c)

1.9\times10^{-5}\,\text{N}

, upward d)

9.6\times10^{-6}\,\text{N}

, upward