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ICSE Class 10 Answered

What happens to the Resistance if the given wire is stretched and the length gets doubled and the area of cross section gets halved.
Asked by aashimegh | 07 Sep, 2019, 10:13: PM
answered-by-expert Expert Answer
Resistance R = ρ×(l/A)  ....................(1)
 
where ρ is resitivity of material, l is length of wire, A is area of cross section.
 
When length is doubled and area is ahlved , new resistance, R' = ρ×[ 2l / (A/2) ] = 4×ρ×(l/A)..............(2)
 
From (1) and (2), it can be seen that new resistance is 4 times of initial value
Answered by Thiyagarajan K | 07 Sep, 2019, 10:42: PM

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