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How Does the Resistance of a Wire Change When: Its Length is Tripled? - CBSE Class 10 - Science

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Question

How does the resistance of a wire change when: 

 its length is tripled? 

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?
Solution How Does the Resistance of a Wire Change When: Its Length is Tripled? Concept: Resistance of a System of Resistors - Resistors in Series.
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