JEE PHYSICS MCQ: CURRENT ELECTRICITY

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Application +4 | -1

A battery of e.m.f.

₹

', and internal resistance '

r

', gives a current of

0.5 \mathrm{~A}

with an external resistor of

12 \mathrm{~ohm}

and a current of

0.25 \mathrm{~A}

with an external resistor of

25 \mathrm{~ohm}

. Calculate (i) internal resistance of the cell and (ii) emf of the cell.

View answer and explanation

Correct option: A

6.5 \mathrm{~V}

Option A (6.5 V) is correct because it's the calculated EMF of the cell using the given currents and external resistances, and solving the resulting equations.

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