1.

A 10 ohm resistance wire is doubled on it. Calculate the new resistance of the wire.

Answer»

Answer:2.5 OHM

Explanation:

R= ρl/A

If resistance get DOUBLED, length of the wire halved and area of cross section will be doubled.

i.e,

R=ρ(l/2)÷2A = ρl/4A = 1/4*R

If ρl/A= 10 (by QUESTION),

NEW resistance = 10/4 = 2.5 ohm



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