AIPMT 2011 Mains | Alternating Current Question 44 | Physics

A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will be

2.0 A

4.0 A

8.0 A

$${{20} \over {\sqrt {13} }}A$$

AIPMT 2011 Prelims

MCQ (Single Correct Answer)

-1

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

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

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

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

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

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