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How Does the Resistance of a Wire Change When: Its Length is Tripled? - Science

How does the resistance of a wire change when: 

 its length is tripled? 

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Solution

Resistance,  

`R=l/A`
 where l = length of  wire
            A= area of cross-section of the wire 

When the length is tripled, l' = 3l

New resistance, 

`R'=l/A ` 

`R'=(rho(3l))/A=(3l)/A` 

`R=3R` 

`R=P/A` 

Thus, the resistance will become three times the original resistance.

  Is there an error in this question or solution?
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APPEARS IN

Lakhmir Singh Class 10 Physics (Science)
Chapter 1 Electricity
Q 22.1
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