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Q.

A 5V battery with internal resistance $2 Ω$ and a 2V battery with internal resistance $1 Ω$ are connected in parallel with unlike polarities connected together .This combination is connected to $10 Ω$ resistor The current in the $10 Ω$ resistor is

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a

0.27 A

b

0.03 A

c

0.05 A

d

0.25 A

answer is D.

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Detailed Solution

With opposite polarities connected in parallel the effective emf is $\frac{E_{1} r_{2} - E_{2} r_{1}}{r_{1} + r_{2}}$

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