AIPMT PRELIMS 2006 Physics Power Factor MCQ Question
A coil of inductive reactance 31 Ω has a resistance of 8 Ω. It is placed in series with a condenser of capacitative reactance 25 Ω. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is:
0.40
0.128
0.80
0.66
Correct Answer
Detailed Explanation
The power factor is calculated using the formula cos(ϕ) = R/Z, where Z is the impedance. The impedance Z is calculated as √(R² + (X_L - X_C)²). Substituting the given values, the power factor is 0.80.
Found an issue with this question?
Related Questions
More from 2006
Assertion: Cancer cells are virtually immortal until the body in which they reside dies. Reason: Cancer is caused by damage to genes regulating the ...
Which of the following pairs constitutes a buffer?
The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm the potential energy stored in it is: