A moving coil instrument with 30 Ω resistance gives a full-scale deflection with a current of 3 mA. This instrument is used with a manganin shunt to extend its range to 300 mA. Calculate the Error caused by a 10oC rise in temperature when: a) The copper moving coil is connected directly across the manganin shunt. b) A 90 Ω manganin resistance is used in series with the moving coil. The temperature coefficient of copper is about 0.004 oC -1 and that of manganin is about 0.00015 oC -1 . Given the formula: Rt = Ro (1 + ρt . t)