A galvanometer having a coil resistance 100Ω gives a full scale deflection when a current of 1 mA is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of 10 V?
a. 10kΩ
b. 8.9kΩ
c. 7.9kΩ
d. 9.9kΩ