If a wire is stretched to make it 0.1% longer, its resistance will

increase by 0.2%

decreases by 0.2%

decrease by 0.05 %

increase by 0.05%

Solution

increase by 0.2%

The resistance,
$straight R space equals space ρl over straight A space equals space ρl squared over straight V where comma space straight rho space equals space resistivity space and space straight V space equals space volume therefore space fraction numerator increment straight R over denominator straight R end fraction space equals space 2 fraction numerator increment l over denominator l end fraction italic space italic equals italic space plus 0.2 percent sign$

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Current Electricity

If a wire is stretched to make it 0.1% longer, its resistance will

increase by 0.2%

decreases by 0.2%

decrease by 0.05 %

increase by 0.05%

Some More Questions From Current Electricity Chapter

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

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For Daily Free Study Material Join wiredfaculty

Current Electricity

If a wire is stretched to make it 0.1% longer, its resistance will increase by 0.2% decreases by 0.2% decrease by 0.05 % increase by 0.05%

Some More Questions From Current Electricity Chapter

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

If a wire is stretched to make it 0.1% longer, its resistance will

increase by 0.2%

decreases by 0.2%

decrease by 0.05 %

increase by 0.05%