A dc source of emf E 1 = 100 V and internal resistance r = 0.5Ω , 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

Question

A dc source of emf E 1 ​ = 100 V and internal resistance r = 0.5Ω , 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?

TestHub · Accepted Answer

R + r 100 ​ = R 90 ​ ​ ⇒ R R + r ​ = 9 10 ​ ⇒ 1 + R 0.5 ​ = 9 10 ​ ⇒ R 0.5 ​ = 9 1 ​ ∴ R = 4.5Ω ​

Physics - Current Electricity Question with Solution | TestHub

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