A student has a resistance wire of 10hm. If the length of this wire is 50 cm, to what length he should stretch it uniformly so as to obtain a wire of 4ohm resistance.
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R (1)=1 ohm
length(1)= 0.5m
r(2)=4ohm
length(2)=?
by using formula
R1/L1=R(2)/L(2)
1/0.5=4/L2
L(2)=4/2
L(2)=2m
length(1)= 0.5m
r(2)=4ohm
length(2)=?
by using formula
R1/L1=R(2)/L(2)
1/0.5=4/L2
L(2)=4/2
L(2)=2m
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