Moving Charges and Magnetism - Result Question 78

80. A galvanometer has a coil of resistance 100ohm and gives a full-scale deflection for 30mA current. It is to work as a voltmeter of 30 volt range, the resistance required to be added will be

(a) 900Ω

(b) 1800Ω

(c) 500Ω

(d) 1000Ω

[2010]

(a) 2.4N

Show Answer

Answer:

Correct Answer: 80. (a)

Solution:

  1. (a) Let the resistance to be added be R, then 30=Ig(r+R)

∴R=30Ig−r=3030×10−3−100=1000−100=900Ω

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