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Current Electricity
Question
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When a current of 5 mA 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 to voltmeter of range 0 – 10 V is

  • 2.535 × 103 Ω

  • 4.005 × 103 Ω

  • 1.985 × 103 Ω

  • 2.045 × 103 Ω

Answer

C.

1.985 × 103 Ω

10 = (5 × 10–3) (15 + R)
r = 1985 Ω

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0.2

0.4

0.6

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118.5

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