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QJEEM20Ph13c9: JEE Main 2020 Physics - Class 12 JEEM20Ph13c9 Solution: A galvanometer of resistance G is converted into a voltmeter of …

A galvanometer of resistance G is converted into a voltmeter of range 0 – 1 V by connecting a resistance R1 in series with it. The additional resistance that should be connected in series with R1 to increase the range of the voltmeter to 0 – 2 V will be :

Multiple Choice Options

  • A G
  • B R1
  • C R1 + G
  • D R1 - G

Step-by-Step Verified Solution

1 = ig(G + R1) ....(1)

2 = ig(R1 + R2 + G) ....(2)

Doing (1) ÷ (2), we get

12=ig(G+R1)ig(G+R1+R2)

⇒ R1 + R2 + G = 2R1 + 2G

⇒ R2 = R1 + G

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