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Show graphically that the average of sin...

Show graphically that the average of sinusoidally varying current in half cycle may of may not be zero.

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Figure shows two parts `A` and `B`, each half cycle.In part `A` we can see that the net area is zero
`therefore ltigt` in part `A` is zero.
In the part `B`, area is positive hence in this part `ltigt!=0`.
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