Question

When a thin metal wire is stretched it becomes longer and thinner

Answer 1

when the metal is gold as it has good ductibility property

Answer 2

Answer:

The ductility of a metal allows it to be stretched to become longer and thinner.

Explanation:

• As the metal is stretched the volume although remains same but there is a change in area that is observed hence the ‘resistance’ of the metal wire changes.
• The more malleable and ductile the metal is the more it can be “stretched into longer and thinner” wires and sheets.
• Since “resistance is inversely proportional to the area” the decrease in area result in increased resistance if the thinner and longer wire.