a certain wire has a radius R another wire of same resistance,has half the length and half the diameter of the first wire.the resistance of second wire is
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Given l2=l1/2
Diameter=2×radius
D2=D1/2 means r2=r1/2
Substituting we get
R1/R2= 8
R1/8=R2
It's 1/8th times oof first wire
Answer:
.the resistance of second wire is 0.25 R
Explanation:
for explanation see the attached photo