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Q.

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

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a

3A

b

4A

c

7A

d

5A

answer is D.

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Detailed Solution

Quantity of heat liberated in the ammeter of resistance R due to direct current of 3A=[(3)2R/J] ii. due to alternating current of 4A=[(4)2R/J] total heat produced second=(3)2RJ+(4)2RJ=25RJ Let the equivalent alternating current be I virtual A, then I2RJ=25RJ OrI =5A
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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 3A. When another alternating current passes through the circuit, the ac ammeter reads 4A. then the reading of this ammeter if dc and ac flow through the circuit simultaneously, is