Current Electricity 4 Question 13

13. When a current of 5mA is passed through a galvanometer having a coil of resistance 15Ω, it shows full scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into a voltmeter of range 010V is

(a) 2.045×103Ω

(b) 2.535×103Ω

(c) 4.005×103Ω

(d) 1.985×103Ω

(2017 Main)

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Solution:

  1. For a voltmeter,

Ig(G+Rs)=VR=VIgG

R=1985=1.985kΩ or R=1.985×103Ω



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