Calculate the new resistance when a wire of resistance 10 ohm is folded thrice its area
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original length = l
original c.s.area = a
new. length = L
new car.s. area = A = 3a
since volume will be same ,
l × a = L × A
la = 3La
L = l/3
resistance = ρl/a = 10 Ω
new resistance = ρL/A
= ρl/9a = 10/9 Ω
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original c.s.area = a
new. length = L
new car.s. area = A = 3a
since volume will be same ,
l × a = L × A
la = 3La
L = l/3
resistance = ρl/a = 10 Ω
new resistance = ρL/A
= ρl/9a = 10/9 Ω
please follow me
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