Question

PLS ANSWER CORRECTLY WITHOUT ANY GUESSING.
Why in a superconductor , once the current starts flowing it persists even when there is no potential difference across it. Even if it has zero resistance then how can current flow at zero potential.

Answer 1

In a superconductor, the current can keep flowing "forever" since there is no resistance. But since conductors have inductance (in fact, superconductors are used most often to create magnets like for an MRI scanner), applying a voltage would not (immediately) cause an infinite current to flow.

The resistance of the sample is given by Ohm's law as R = V/I. If the voltage is zero, this means that the resistance is zero.

hence potential difference will also be zero