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How Does the Resistance of a Wire Change When: Its Material is Changed to One Whose Resistivity is Three Times? - CBSE Class 10 - Science

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Question

How does the resistance of a wire change when: 

its material is changed to one whose resistivity is three times?

Solution

Resistance,  

`R=l/A`

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

 When the material is changed to one whose resistivity is three times:

New resistivity, `p'=33rho` 
The new resistance,  
`R'=(rho^eta)/A` 

`R=(3rho)/A=3R`
 
Thus, the resistance will become three times the original resistance.
  Is there an error in this question or solution?

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Solution How Does the Resistance of a Wire Change When: Its Material is Changed to One Whose Resistivity is Three Times? Concept: Factors on Which the Resistance of a Conductor Depends.
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