Mathematics

Problem

25\,\text{cm}

long straight conductor carries a current of

2.5\,\text{A}

at right angles to a uniform magnetic field. The force on the conductor is measured as

1.0\times10^{-2}\,\text{N}

. Determine the magnetic field strength, expressed in millitesla (mT), correct to two significant figures. a)

1.6\,\text{mT}

160\,\text{mT}

16\,\text{mT}

6.3\,\text{mT}