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QNEET-2020-Ph-730: NEET 2020 Physics - Class 12 NEET-2020-Ph-730 Solution: A series LCR circuit is connected to an ac voltage source. When …
A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit the phase difference between current and voltage is . If instead C is removed from the circuit the phase difference is again between current and voltage. The power factor of the circuit is: 0.5 -1.0 1.0 zero
Multiple Choice Options
- A 0.5
- B 1
- C _ 1.0
- D zero
Step-by-Step Verified Solution
The power factor for the LCR circuit will be :
When L is removed,
tan _ _ = | X C | R
_ tan _ � 3 = X C R
...(i)
When C is removed,
tan _ _ = | X L | R
_ tan _ � 3 = X L R
...(ii)
Since, X L = X C , the circuit is in resonance,
Z = R
Power factor = cos _ = R Z
= 1