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  4. In the circuit shown, the current through 8 Ω , is same before and after connecting E. The value of E is

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Q. In the circuit shown, the current through $ 8\,\Omega , $ is same before and after connecting $E$. The value of $E$ isPhysics Question Image

KEAMKEAM 2010Current Electricity

Solution:

$ i=\frac{E}{R}=\frac{12}{24}=\frac{1}{2}A $
$ \therefore $ $ E=\frac{1}{2}\times 8=4\,V $