1
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
In a circuit L, C and R are connected in series with an alternating voltage source of frquency $$f.$$ The current leads the voltage by 45o. The value of C is
A
$${1 \over {\pi f\left( {2\pi f\,L - R} \right)}}$$
B
$${1 \over {2\pi f\left( {2\pi f\,L - R} \right)}}$$
C
$${1 \over {\pi f\left( {2\pi f\,L + R} \right)}}$$
D
$${1 \over {2\pi f\left( {2\pi f\,L + R} \right)}}$$
2
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
A coil of 40 henry inductance is connected in series with a resistance of 8 ohm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is
A
5 seconds
B
1/5 seconds
C
40 seconds
D
20 seconds
3
AIPMT 2002
MCQ (Single Correct Answer)
+4
-1
For a series LCR circuit the power loss at resonance is
A
$${{{V^2}} \over {\left[ {\omega L - {1 \over {\omega C}}} \right]}}$$
B
$${I^2}L\omega $$
C
$${I^2}R$$
D
$${{{V^2}} \over {C\omega }}$$
4
AIPMT 2001
MCQ (Single Correct Answer)
+4
-1
A capacitor of capacity C has reactance X. If capacitance and frequency become double then reactance will be
A
4X
B
X/2
C
X/4
D
2X
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