A primary cell has an emf of 1.5 volts, when short-circuited it gives a current

Question

A primary cell has an emf of 1.5 volts, when short-circuited it gives a current of 3 amperes. The internal resistance of the cell is

Options:

A . 4.5 ohm

B . 2 ohm

C . 0.5 ohm

D . 14.5 ohm

Answer: Option C
:
C

i_{S C} = \frac{E}{r} \Rightarrow 3 = \frac{1.5}{r} \Rightarrow r = 0.5 Ω

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