A superconducting ring can carry a current for an indefi nite length of time. Isn’t...

anudoneddbv

anudoneddbv

Answered

2022-07-15

A superconducting ring can carry a current for an indefi nite length of time. Isn’t this a perpetual motion machine, which violates the fi rst or second law of thermodynamics? Explain.

Answer & Explanation

Tamoni5e

Tamoni5e

Expert

2022-07-16Added 14 answers

Perpetual motion machine is a kind of machine which can do work without any energy input.
A Superconductor is an hypothetical material which offers zero resistance. The entropy change in a superconducting material is zero as it is a highly ordered material.
From Second law of thermodynamics:
S = Q T 0 = Q T Q = 0
From first law of thermodynamics:
Q = U + W 0 = U + W W = U
Since internal energy of a superconductor is constant.
U = 0
Then,
Work done, W = 0
But, in this case the superconductor is carrying the current for indefinite amount of time so work done can't be zero. So it is violating the First Law of Thermodynamics.

Do you have a similar question?

Recalculate according to your conditions!

Ask your question.
Get your answer.

Let our experts help you. Answer in as fast as 15 minutes.

Didn't find what you were looking for?