Question

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

• A. $16{^\circ}C$
• B. $10{^\circ}C$
• C. $20{^\circ}C$
• D. $12{^\circ}C$

Answer 1

Answer: (C)

$20{^\circ}C$

Answer 2

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