Question

if a wire having uniform area is stretched 2 times than its original length then how will its resistance change? ​

Answer 1

We have

Resistance= Resistivity x length/area

When the wire is stretched to double the length , the area of cross section gets reduced to half.

So

New Resistance = Resistivity x 2length/area/2

I.e,

New resistance = (Resistivity x length/area)x4

i.e, New resistance = Resistance x 4

When area is increased by 2 times, the resistance multiplies by four times.

Hope you understood. Keep exploring.

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Answer 2

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➪ ᴘᴏsᴛᴀɢᴇ ᴇxᴘᴇɴsᴇs ᴀ/ᴄ ... ᴅʀ. 250

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