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A dc source of emf E ₁=100 ~V and internal resistance r=0.5 , a storage battery of emf E ₂=90 ~V and an external resistance R are connected as shown in figure. For what value of R no current will pass through the battery?

Options

  1. A5.5
  2. B3.5
  3. C4.5
  4. D2.5

Correct answer

C. 4.5

Step-by-step solution

100 R+r = 90 R aligned & R + r R = 10 9 & 1+ 0.5 R = 10 9 & 0.5 R = 1 9 & R =4.5 aligned

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