A) the power factor \[\cos \,\phi \ge 0,\,P\ge 0\]
B) the driving force can give no energy to the oscillator (P = 0) in some cases
C) the driving force cannot siphon out(P < 0)the energy out of oscillator
D) All of the above
Correct Answer: D
Solution :
| (d) All of the above |
| Here, \[P={{l}^{2}}Z\,\,\cos \,\phi \] |
| (a) If power factor \[\cos \,\phi \ge 0\Rightarrow P\ge 0\]. |
| (b) For wattless component the driving force shall give no energy to the oscillator. So, at \[\phi =90{}^\circ ,\,\,P=0\]. |
| (c) The driving force cannot siphon out the energy out of oscillator, i.e., P cannot be negative. |
| Hence, all options are correct. |
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