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  • A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now beOption: 1 Halved<d

A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be

Option: 1

Halved


Option: 2

One-fourth


Option: 3

Four times


Option: 4

Doubled


Answers (1)

best_answer

We know that, Resistance R=\rho \frac{l}{A}
i.e. R \propto \ell
Since, the length becomes half, \ell^{\prime}=\frac{\ell}{2}

\therefore \mathrm{R}^{\prime}=\frac{\mathrm{R}}{2}

Q=\frac{V^2}{R} t \text {. When } R \text { is halved, then } Q \text { is doubled }
 

Posted by

Suraj Bhandari

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