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Moving Charges and Magnetism question

2010 · Q143
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Moving Charges and Magnetism question

2010 · Q143

NEETPhysicsMoving Charges and MagnetismMCQ+4 / −1
A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be
  1. A
    900 Ω\OmegaΩ
  2. B
    1800 Ω\OmegaΩ
  3. C
    500 Ω\OmegaΩ
  4. D
    1000 Ω\OmegaΩ
View written solutionFree

Correct answer: A

Let the resistance to be added be R, then

30 = Ig (r + R)

∴\therefore∴ R = 30Ig−r{{30} \over {{I_g}}} - rIg​30​−r

= 3030×10−3−100{{30} \over {30 \times {{10}^{ - 3}}}} - 10030×10−330​−100

= 1000 - 100 = 900 Ω\Omega Ω

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