The following combination are concerned with experiments of the characterization and use of a moving coil galvanometer.
The series combination of variab resistance R, one `100 Omega` resistor and moving coil galvanometer is connected to a mobile phone charger having negligible internal resistance. The zero of the galvanometer lies the centre and the pointer can move 30 division full scale on either side depending on the directin of current. The reading of the galvanometer is 10 divisions and the voltages across the galvanometer and `100 Omega` resistor are respectively 12mV and 16 mV.
The figure os merit of the galvanometer is microampere per division is :
A. 16
B. 20
C. 32
D. 10
