| ⇦ | 
| ⇨ |
In a circuit, L,C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45⁰. The value of C is
Options
(a) 1/πf(2πfL+R)
(b) 1/πf(2πfL-R)
(c) 1/2πf(2πfL-R)
(d) 1/2πf(2πfL+R)
Correct Answer:
1/2πf(2πfL+R)
Explanation:
The phase difference ɸ between current and voltage is given by
tan ɸ = (Xʟ – Xc) / R
(Xʟ – Xc) / R = tan 45° = 1 ⇒ Xc = X⇒ + R
1 / 2πfC = 2πfL + R
Therefore, C = 1 / 2πf(2πfL + R)
Related Questions: - The magnetic susceptibility of a material of a rod is 299. Permeability of vacuum
- The radioactivity of a certain material drops to 1/16 of the initial value in 2 hours.
- A disc of radius 0.1 m is rotating with a frequency 10 rev/sec in a normal magnetic
- A rod lies along the X-axis with one end at the origin and the other at x→∞. It carries
- Four cells, each of emf E and internal resistance r, are connected in series across
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The magnetic susceptibility of a material of a rod is 299. Permeability of vacuum
- The radioactivity of a certain material drops to 1/16 of the initial value in 2 hours.
- A disc of radius 0.1 m is rotating with a frequency 10 rev/sec in a normal magnetic
- A rod lies along the X-axis with one end at the origin and the other at x→∞. It carries
- Four cells, each of emf E and internal resistance r, are connected in series across
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply