Question

If resister of any coil is 120ohm. Calculate the resistance when its length is increased 20% and its dia increased by 50%

Answer 1

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if, length= l and resistance (R) =pl/A=p(l^2)/V

Then , increase in length = l*20/100

l'= l+(l/5)

l'=6l/5

Final resistance = p( l'^2)/V

R'=p *36(l^2)/25V

R'=(36/25)R

Increase in resistance (%) ={( R'-R) /R}*100

=11R*100/25R %

=44%



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