In the figure each cell has an emf of 1.5 V and internal re…

Physics Current Electricity Combination of Cells MCQ (Single Correct)

In the figure each cell has an emf of 1.5 V and internal resistance of 0.40 Ω Ω . Calculate:

(i) current I

(ii) current in the 36 Ω Ω resistor

(iii) potential difference across A and B.

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

[(i) = 0.5 A

(ii) = 0.0833 A

(iii) = 1.7 V]

Sol. (i) Effective emf = 4 × 1.5 – 1.5 = 4.5 V

(ii) Effective internal resistance

r eq = + 0.4 = 1.2 Ω Ω

R eq = 6 + 1.8 + 1.2 = 9 Ω Ω

I = amp

I 36 =

(iii) V AB = E + ir = 1.5 + × 0.4 = 1.5 + 0.2 = 1.7 V

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