AIPMT PRELIMS2005Physics-AC Circuits
AIPMT PRELIMS 2005 Physics Resonance in RLC Circuits MCQ Question
Type: MCQ-numerical-Hard-Class 12
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 45°. The value of C is :
A
1/(2πf(2πfL + R))
B
1/(2πf(2πfL - R))
C
1/(2πf(R - 2πfL))
D
1/(2πf(R + 2πfL))
Correct Answer
Option C
Detailed Explanation
For the current to lead the voltage by 45°, the circuit must be capacitive. The condition for resonance gives the value of C as (1)/(2πf(2πfL + R)).
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