MPSC Rajyaseva 2018 GS Paper 1 — Question 39
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10 ओमचा रोध 12 V च्या विद्युतघटस जोडल्यास रोधातून 1.1 A विद्युतधारा वाहते. विद्युतघटाचा अंतर्गत रोध काढा. A resistor of 10 Ω connected across a cell of emf 12 V, draws the current of 1.1 A. Find the internal resistance of the cell.
a)10 Ω
b)0.1 Ω
c)10.9 Ω
d)0.91 Ω✓ Correct
Using formula E = I(R + r), where E = 12V, I = 1.1A, R = 10Ω. 12 = 1.1(10 + r) => 10 + r = 12/1.1 = 10.91 => r = 0.91 Ω.