Question 726: Current Electricity

Question

A constant voltage is applied between the two ends of a uniform metallic wire, Some heat is developed in it. The heat developed is halved if

Accepted Answer

The heat produced is given by,
$$H=\frac{V^2}{R} 	ext { and } R=\frac{1}{\pi r^2}, H=\left(\pi V^2ight) \frac{r^2}{l}$$
Thus, heat is halved if length is halved.

Answer

both the length and the radius of the wire are halved

Answer

both the length and the radius of the wire are doubled.

Answer

The radius of the wire is doubled

Answer

The length of the wire is halved.

Current Electricity

A constant voltage is applied between the two ends of a uniform metallic wire, Some heat is developed in it. The heat developed is halved if

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