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Graph showing the variation of current v...

Graph showing the variation of current versus voltage for a material GaAs is shown in figure. Identify the region of (i) negative resistance (ii) where Ohm's law is obeyed.

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Side bands (Lower side band and upper side band) are produced due to superposition of low frequency modulating signals on high frequency carrier waves.
Reason: The frequency of lower side band is `omega_(c )-omega_(m)` and of upper side band is `omega_(c )-omega_(m)`.
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