AP EAMCET2002PhysicsCurrent Electricity
A moving coil galvanometer of resistance 100 shows full scale deflection when a current of 100 micro-amperes passes through it. If it is intended to show full scale deflection when a current of 1 milliampere passes through it, the value of shunt resistance in ohms to be connected to the galvanometer is.
Options
- A9 4
- B10 3
- C100 9
- D900 7
Correct answer
C. 100 9
Step-by-step solution
Resistance of galvanometer gathered G=100 I_g=100 A =100 10⁻⁶ ~A =0.1 10⁻³ ~A I=1 ~mA =1 10⁻³ ~A gathered Shunt resistance aligned S & = I_g G I-I_g = 0.1 10⁻³ 100 1 10⁻³-0.1 10⁻³ & = 1 10⁻² 0.9 10⁻³ = 10^2 9 = 100 9 aligned