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The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of is
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Correct option is D
I=εR+ror IR+Ir=εHere, R=10Ω, r=?, ε=2.1V,I=0.2A ∴ 0.2×10+0.2×r=2.1 2+0.2r=2.1 0.2r=0.1 or r=12=0.5ΩSimilar Questions
In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is 5Ω . The cable is replaced by 6 different insulated copper wires, the radius of each wire is 3 mm . Now the total resistance of the cable will be
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