Two wires have resistance of $2$ $\Omega$ and $4$ $\Omega$ connected to same voltage, ratio of heat dissipated at resistance is
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(c) $H = \frac{{{V^2}}}{R}t$ $ \Rightarrow $ $\frac{{{H_1}}}{{{H_2}}} = \frac{{{R_2}}}{{{R_1}}} = \frac{4}{2} = \frac{2}{1}$
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