Physics Discuss

Which of the following statements are not true of a moving-coil milliammeter?...

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Question 315
A
I and IV only
B
II and III only
C
III and IV only
D
I, II and III only
E
I, III and IV only
Explanation

Converting an ammeter to a voltmeter involves increasing the resistance of theammeter. This is done by adding a high resistance in series with the ammeter. Also,A moving coil meter indicates the average (mean) of a varying current through it,which is zero for AC. For this reason moving-coil meters are only usable directly for DC, not AC. Hence, I and IV are false.


Correct option: A
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