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A simple circuit consists of a known resistance R_A=2 M and an unknown resistance R _ B both in series with a battery of 9 volt and negligible internal resistance. When the voltmeter is connected across the resistance R_A , it measures 3 volt but when the same voltmeter is connected across R_B it reads 4.5 volt. The voltmeter measures 9 V across the battery. Considering that the voltmeter has a finite resistance r ,

Options

  1. AR_B=3 M and r=6.0 M
  2. BR_B=2.5 M and r=6.0 M
  3. CR_B=4 M and r=12 M
  4. DR_B=4.5 M and r=6.0 M

Correct answer

A. R_B=3 M and r=6.0 M

Step-by-step solution

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