A moving coil galvanometer allows a full scale current of 10−4 A. A series resistance of 2MΩ is required to convert the above galvanometer into a voltmeter of range 0−5V. Therefore the value of shunt resistance required to convert the above galvanometer into an ammeter of range 0−10 mA is :
a. 500Ω
b. 100Ω
c. 200Ω
d. 10Ω