A primary coil has 600 turns and produces a flux of per turn when a current of flows…

PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A primary coil has 600 turns and produces a flux of

5\times10^{-3}\,\mathrm{Wb}

per turn when a current of

3\,\mathrm{A}

flows through it. The flux through a secondary coil of 1000 turns is

6\times10^{-3}\,\mathrm{Wb}

per turn. When the switch is opened, the primary current drops to zero in

0.2\,\mathrm{s}

. Find: (1) Mutual inductance. (2) The induced emf in the secondary. (3) The self-inductance of the primary coil.