Question

which amongst the following can be used to make a tester that can detect weak current in a circuit?

(a)bulb
(b)LED
(c) compass needle
(d) BOTH B and C​

Answer 1

LED: LED is a device which glows even when very small amount of current is passed through it. Hence, it can be used to detect weak currents as it will glow even when very small current is passed through it.

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