JEE PHYSICS MCQ: ALTERNATING CURRENT

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An ac ammeter is used to measure current in a circuit. When a given direct current passes through the circuit, the ac ammeter reads

3 \mathrm{~A}

. When another alternating current passes through the circuit, the ac ammeter reads

4 \mathrm{~A}

. Then find the reading of this ammeter (in

\mathrm{A}

), if dc and ac flow through the circuit simultaneously.

View answer and explanation

Correct option: A

Option A (5) is correct because the AC ammeter reads the RMS value of the combined DC and AC currents, which is calculated to be 5A.

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