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Q.

Cell A has emf 2E and internal resistance 4r. Cell B has emf E and internal resistance r. The negative of A is connected to the positive of B and a load resistance of R is connected across the battery formed. If the terminal potential difference across A is zero, then R is equal to

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a

3r

b

2r

c

r

d

5r

answer is C.

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i=e1+e2R+r1+r2,V1=E1−ir1=0
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