Question

A 4 ohm wire is doubled on it. Calculate the new resistance of the wire

Answer 1

Answer:

2ohm

Explanation:

If the wire is doubled on itself , it acts as a parallel connection.....

therefore,

$\frac{1}{r } = \frac{1}{a} + \frac{1}{b}$

where a and b are two given resistances.

therefore,

$\frac{1}{r} = \frac{1}{4} + \frac{1}{4} = \frac{1}{2}$

therefore,

$r = 2 \: ohm$