• # question_answer A $5{}^\circ C$ rise in temperature is observed in a conductor by passing a current. When the current is doubled the rise in temperature will be approximately                                            [CBSE PMT 1998] A)            $16{}^\circ C$                     B)            $10{}^\circ C$ C)            $20{}^\circ C$                     D)            $12{}^\circ C$

Since $H\propto {{i}^{2}},$ so on doubling the current, the heat produced and hence the rise in temperature becomes four times.