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Question

Internal resistance of a 2.1 V cell which gives a current of 0.2 A through an external resistance of 10 Ω is
  1. 0.2 Ω
  2. 0.5 Ω
  3. 0.8 Ω
  4. 1.0 Ω


Solution

The correct option is B 0.5 Ω
 
2.110+r=0.2
2.1=2+0.2r
0.1=0.2r
r=0.5 Ω

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