MHT CET202310 May 2023Evening ShiftPhysicsCurrent ElectricityActual
A galvanometer has resistance ' G ' and range ' V g '. How much resistance is required to read voltage upto ' V ' volt?
Options
- AG ( V V _ g -1 )
- BG ( V + V _ g V )
- CG ( V-V_g V )
- DGV _ g
Correct answer
A. G ( V V _ g -1 )
Step-by-step solution
Given: Resistance of the galvanometer = G Range of the galvanometer = V _ g The series resistance value to be used for converting the galvanometer into a voltmeter of range 0 to V _ g ^ is, R = V _ z I _ g - G Also, I _ g = V _ g G To increase the measuring range to V , the new resistance value R ^ = V ( V _ g G ) - G = VG V _ s - G = G ( V V _ g -1 )