Physics

Problem

A straight wire of total length

40\,\text{cm}

passes through a rectangular region where a uniform magnetic field exists only over the central

10\,\text{cm}

segment. The current in the wire is perpendicular to the field. Which length should be substituted for

L

while calculating the magnetic force on the wire? a)

40\,\text{cm}

20\,\text{cm}

10\,\text{cm}

30\,\text{cm}