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Galvanometer

A square wave...

Question

A square wave AC of current 2 A is passed through on AC ammeter. Reading shown by it is:

A

\sqrt{2} A

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B

2

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C

\frac{1}{\sqrt{2}} A

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D

none of these

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Solution

The correct option is C $\frac{1}{\sqrt{2}} A$
Current $= 2 A (I_{0})$
rms value $= \frac{I_{0}}{\sqrt{2}} = 2 / \sqrt{2} = \sqrt{2} A$
Reading $= \frac{1}{I_{r m s}} = \frac{1}{\sqrt{2}} A$

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