AIPMT 2006 | Alternating Current Question 56 | Physics

A coil of inductive reactance 31 $$\Omega $$ has a resistance of 8 $$\Omega $$. It is placed in series with a condenser of capacitative reactance 25 $$\Omega $$. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is

0.33

0.56

0.64

0.80

AIPMT 2005

MCQ (Single Correct Answer)

-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 45^o. The value of C is

$${1 \over {\pi f\left( {2\pi f\,L - R} \right)}}$$

$${1 \over {2\pi f\left( {2\pi f\,L - R} \right)}}$$

$${1 \over {\pi f\left( {2\pi f\,L + R} \right)}}$$

$${1 \over {2\pi f\left( {2\pi f\,L + R} \right)}}$$

AIPMT 2004

MCQ (Single Correct Answer)

-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

5 seconds

1/5 seconds

40 seconds

20 seconds

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