A dc source of emf E1 = 100 V and internal resistance r = 0.5 W, a storage battery of emf E2 = 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 ?

Question:

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

  1. $5.5 \Omega

  2. $3.5 \Omega$

  3. $4.5 \Omega$

  4. $2.5 \Omega$


Correct Option: 3

Solution:

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