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Questions  

Two identical cells connected in series send 10 amp current through a 5 Ω resistor. When they ale connected in parallel, they send 8 amp current through the same resistance. What is the internal resistance of each cell

a
zero
b
2.5 Ω
c
10 Ω
d
1.0 Ω

detailed solution

Correct option is B

For series combination2E=(5+2r)10  or  E=5+r28Solving, we get  r = 2.5 Ω

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