Answer to Question 4 |

A moving coil meter has a coil of
dimensions 1.5 cm × 2.0 cm. The coil has 600 turns and is placed
in a magnetic field that has a flux density of 0.25 T. The coil is
mounted by two springs of torsion constant 1.2 mN
m rad
Calculate the current flowing in the coil. |

Formula:
Remember that there are two springs. Remember to convert the angle to radians:
Answer is to 2 significant figures as the data are to 2 s.f. |