A cylindrical copper rod has resistance R. If it is cut to half of its original...

Question

Question

A cylindrical copper rod has resistance R. If it is cut to half of its original lenth, its new resistance is:

Answer 1

Answer #1

resistance is given by

is resistivity which is a property of material

A is cross section area

L is length

We can see that is length(L) is made half i.e L/2

Resistance also becomes half i.e R/2

Answer 2

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