1.

A wire has resistance of 8 ohm. If its length ismade half by folding, find its resistance after thefree ends are connected to each other.(Ans : 2ohm)

Answer»

Resistance R = 8 ohmlet's take length as Land cross section area as A

here we need to use the formula R= rho(L/A) here rhostands for resistivity

as length is halved and r the radius is increased by two R is reduced to R/4=8/4=2 ohm

so new resistance will be 2 ohm



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