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Q.

The combination of two identical cells, whether connected in series or parallel combination provides the same current through an external resistance of 2Ω. The value of internal resistance of each cell is

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a

2Ω

b

4Ω

c

6Ω

d

8Ω

answer is A.

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Detailed Solution

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I1=2E2r+2;

I2=Er2+2=2Er+4 ;  I1=I2  ⇒2r+2=r+4 ⇒2r−r=2 ⇒r=2 Ω

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