1. The magnetic flux density at a distance of 1.4 m from the centre of a current carrying conductor is 0.25 mT. Determine the value of the current.
2. A moving coil meter has a coil resistance of 25Ω, and requires a current of 0.25 mA to produce full-scale deflection. Determine the values of shunts required to extend its current reading range to
(a) 10 mA, and
(b) 1 A. Sketch the relevant circuit diagram.