Question

Suggest one way of discriminating a wire carrying current from a wire carrying no current

Answer 1

you can easly do this by using tester.

Answer 2

Suggest one way of discriminating a wire carrying current from a wire not Carring current?

A current carrying wire will produce a deflection in needle as it poses a magnetic field.

Whereas, no current carrying wire will not produce any deflection in needle as it do not poses magnetic field.