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Find the equivalent emf and internal res...

Find the equivalent emf and internal resistance of the arrangement shown in figure.

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The correct Answer is:
B
`E_(eq)=(Sigma(E//r))/(Sigma(1//r))`
`=((10//1)+(4//2)+(6//2))/((1//1)+(1//2)+(1//2))`
`7.5V`
`1/r=1/1+1/2+1/2`
`:. R=0.5Omega`
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