A current of $2\, A$ passing through conductor produces $80\, J$ of heat in $10$ seconds. The resistance of the conductor is ............ $\Omega$
AIPMT 1989, Easy
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$H = {i^2}Rt$ $ \Rightarrow $ $R = \frac{H}{{{i^2}t}} = \frac{{80}}{{4 \times 10}} = 2\,\,\Omega $
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