Wed June 06, 2012 By: Anjali

a resistance wire made from german silver has aresistance of 4.25 ohm .calculate the resistance of another wire of the same material ,such that its lenghtincreased by 4 times and the cross sectional area is decreased by 3 times.

Expert Reply
Fri June 08, 2012
R=?l/A=4.25 ohm given
length of new wire=4l
area of cross section of new wire=A/3
material same ie ?.
so res of new wire=?4l/(A/3)=12 ?l/A=12 x4.25=51 ohm
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