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A dc source of emf \tiny E_1=100\ V and internal resistance \tiny r=0.5\ \Omega , a storage battery of emf \tiny 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 ?

A dc source of emf \tiny E_1=100\ V and internal resistance \tiny r=0.5\ \Omega , a storage battery of emf \tiny 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 ?
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