Three cells of emf, E, 2E and 5E having internal resistances r, 2r and 3r, variable resistance R is shown in the figure. Find the expression for the current.
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Answer: The current is
Explanation:
Given that,
Emf of first cell = E
Emf of second cell = 2E
Emf of third cell = 5E
Internal resistance of first cell = r
Internal resistance of second cell = 2r
Internal resistance of third cell = 3r
Variable resistance = R
Now, the current
Hence, this is the required solution.
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