Hot wire ammeters are used for measuring

A.C only

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D.C only

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both A.C and D.C

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None of these

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Solution

The correct option is C both A.C and D.C
Hot wires ammeters uses the heating effect of current so it is all the same for both a.c. & d.c. as heat generated is square function of current so even the sign in a.c. doesn't matter.

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I_{1} = 3 sin ω t

I_{2} = 4 sin (π / 2 - ω t)

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