A 4 ohm wire is doubled. calculate the new resistance of the wire
If a 4 ohm wire is doubled its resistance will be 8 ohm. This is because resistance of a conductor is directly proportional to its length.
Formula to prove this is :- R=(p*l)/A
where R=resistance
p=resistivity
l = length,and
A=area of cross-section
Formula to prove this is :- R=(p*l)/A
where R=resistance
p=resistivity
l = length,and
A=area of cross-section