Question

A wire of length l ,resistance R ohm is twisted to make its thickness 3 times. What is the new resistance of wire?

Answer 1

Let the resistance of wire be 'R' , length be 'l' and thickness be 'a'.

R = ¶ l / a

When wire is twisted, it's thickness becomes thrice of what it was before.

Let the new resistance be 'R''.

R' = ¶ l / 3a

R / R' = ¶ l / a / ¶ l / 3a

R / R' = 3 / 1

R' = R / 3

Hence the new resistance is one third of the previous resistance of the wire.

{¶ is used as a symbol for rho.}

Be Brainly,!!!!

Answer 2

Explanation:

this is your answer thanku