Question

how do we test the presence of weak current in a circuit?​

Answer 1

Answer:

A magnetic field is created around a current carrying wire even when very small amount of current is passed through it. A compass needle shows deflection in the presence of magnetic field. Hence, a compass can be used to detect a weak current.

Explanation:

Answer 2

✪ A magnetic field is created around a current carrying wire even when very small amount of current is passed through it. A compass needle shows deflection in the presence of magnetic field. Hence, a compass can be used to detect a weak current.