Physics

Problem

The magnetic field inside a long solenoid is required to be

5.0\,\text{mT}

. The solenoid has

800

turns per metre and is air-cored. Calculate the current that must be passed through it. a)

2.5\,\text{A}

10\,\text{A}

5.0\,\text{A}

0.50\,\text{A}