AIPMT 2011 Prelims | Alternating Current Question 45 | Physics

An ac voltage is applied to a resistance R and an inductor L in series. If R and the inductive reactance are both equal to 3 $$\Omega $$, the phase difference between the applied voltage and the current in the circuit is

$$\pi /6$$

$$\pi /4$$

$$\pi /2$$

zero

AIPMT 2011 Prelims

MCQ (Single Correct Answer)

-1

In the ac circuit an alternating voltage e = $$200\sqrt 2 $$sin100t volts is connected to a capacitor of capacity 1 $$\mu $$F. The r.m.s. value of the current in the circuit is

10 mA

100 mA

200 mA

20 mA

AIPMT 2010 Mains

MCQ (Single Correct Answer)

-1

A condenser of capacity C is charged to a potential difference of V₁. The plates of th condenser are then connected to an ideal inductor of inductance L. The current through the inductor when the potential difference across the condenser reduces to V₂ is

$${\left( {{{C{{\left( {{V_1} - {V_2}} \right)}^2}} \over L}} \right)^{{1 \over 2}}}$$

$${{C\left( {V_1^2 - V_2^2} \right)} \over L}$$

$${{C\left( {V_1^2 + V_2^2} \right)} \over L}$$

$${\left( {{{C\left( {V_1^2 - V_2^2} \right)} \over L}} \right)^{{1 \over 2}}}$$

AIPMT 2010 Prelims

MCQ (Single Correct Answer)

-1

A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformer is 80%, the current drwn by the primary windings of the transformer is

3.6 ampere

2.8 ampere

2.5 ampere

5.0 ampere

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