If a copper wire is stretched to make it...

If a copper wire is stretched to make its radius decrease by `0.1%`, then the percentage increase in resistance is approximately -

A

`-0.4%`

B

`+0.8%`

C

`+0.4%`

D

`+0.2%`

Text Solution

Verified by Experts

The correct Answer is:

C

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Knowledge Check

When a wire drawn until its radius decreases by 3% then percentage of increase in resistance is-

A

`10%`

B

`9%`

C

`6%`

D

`12%`

If a copper wire is stretched so that its length increases by 20% then what is the percentage increase in its resistance (assuming its volume remaing constant) ?

A

`10%`

B

`21%`

C

`44%`

D

`120%`

A wire is stretched so as to change its diameter by 0.25% . The percentage change in resistance is

A

`4.0%`

B

`2.0%`

C

`1.0%`

D

`0.5%`

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