Question

Which of the following can be used in a tester along
with a battery to detect a weak current in the circuit?
A LED only
(2) A coil wounded over a compass needle only
(3) Bulb of 100 W only
(4) Either LED or a coil wounded over a compass
needle​

Answer 1

Answer:

4

Explanation:

either led or a coil wounded over a compass needle (4)