Question

A 4 ohm resistance wire is doubled on itself calculate the new resistance of the wire

Answer 1

Answer:

Let,  

       Length of wire= l

       Old Resistance,r= 4ohm

Doubling the length,

=2l

since, Resistance ∝ Length of wire

r is also doubled

Therefore, new resistance=2(4) ohm

                                            =8ohm