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An ac ammeter is used to measure currnet...

An ac ammeter is used to measure currnet in a circuit. When a given direct current passes through the circuit. The ac ammeter reads 3 A. When another alternating current passes through the circuit, the ac ammeter reads 4A. Then find the reading of this ammeter (inA), if dc and ac flow through the circuit simultaneously.

A

`3 A`

B

`4 A`

C

`7 A`

D

`5 A`

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The correct Answer is:
D
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