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Alternating Current

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Q.

A resistor and a capacitor are connected in series with an AC source. If the potential drop across the capacitor is 5 V and that across resistor is 12 V, then applied voltage is

Q.

An inductor (L = 100 mH), a resistance (R = 100Ω) and a battery (E = 100V) are initially connected in series as shown in the figure. After a long time the battery is disconnected after short circuiting the points A and B. The current in the circuit 1 ms after the short circuit is

                                                    

Q.

A 4 µF capacitor, a resistance of 2.5 mΩ is in series with 12 V battery. Find the time after which the potential difference across the capacitor is 3 times the potential difference across the resistor.

Q.

In an R-C circuit while charging, the graph of In I versus time is as shown by the dotted line in the adjoining diagram where I is the current. When the value of the resistance is doubled, which of the solid curves best represents the variation of In I versus time?

                                                    

Q. In colpitt the feedback network consists of?

In Colpitt oscillator two capacitors are placed across a common inductor and the center of the two capacitors is tapped.

Q. In an ideal choke, ratio of its resistance L to its DC resistance R is?

In an ideal choke, ratio of its inductance L to its DC resistance R is infinity.

Q. In a circuit, the current lags behind the voltage by a phase difference of π/2, then circuit will contain which of the following?

When a circuit contains inductance only, then the current lags behind the voltage by the phase difference of π/2 or 90 degree.

While in a purely capacitive circuit, the current leads the voltage by a phase angle of π/2 or 90 degree.

In a purely resistive circuit current is in phase with the applied voltage.

Q. In colpitt the feedback network consists of?

In Colpitt oscillator two capacitors are placed across a common inductor and the center of the two capacitors is tapped.

Q. An a.c. source is of 120 volt , 60Hz the value of the voltage after 1/360 sec from the start will be?

146.4 Volt

Q. Is Alternating Current important for IIT JEE?

Not only Alternating current is an important topic but its difficult as well so its advised by JEE experts that students need to focus more on this chapter especially on circuits and formulae used.

Q. What is Alternating Current?

Alternating current can be defined as the current flow which changes its magnitude and direction repeatedly after regular time intervals and flows in one direction.

Q. What is the weightage of Alternating current in IIT JEE?

Every year 2 questions are asked from this topic and its weightage is around 6.6%.

Q. What are the applications of Alternating Current?

The most common application of AC current is for producing and transporting electricity to businesses and homes.