a 4 ohm non insulated wire is bent in the middle by 180 degree and both the halves are twisted with each other.find its ew resistance.
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resistance= R = рl/ A
p= resistivity
l= length
A = cross sectional area
initial R = 4 ohm
by folding the wire in double
A'= 2A
l'= l/2
so, new resistance = R'= pl'/A'
= pl/2/2A
R'= R/4
p= resistivity
l= length
A = cross sectional area
initial R = 4 ohm
by folding the wire in double
A'= 2A
l'= l/2
so, new resistance = R'= pl'/A'
= pl/2/2A
R'= R/4
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