A coil of self-inductance L is connected in series with a bulb B and an AC source. The brightness of the bulb decreases when

(a) frequency of the AC source is decreased

(b) the number of turns in the coil is reduced

(c) a capacitance of reactance Xc=XL is included in the same circuit

(d) an iron rod is inserted in the coil

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In an electrical circuit R, L, C, and an AC voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and the current in the circuit is $\mathrm{\pi }/3.$ If instead, C is removed from the circuit, the phase difference is again $\mathrm{\pi }/3.$ The power factor of the circuit is

(a) 1/2

(b) 1/$\sqrt{2}$

(c) 1

(d) $\sqrt{3}/2$

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The instantaneous values of alternating

current and voltages in a circuit are given

as

The average power in Watts consumed in the

circuit is

(a) $\frac{1}{4}$

(b) $\frac{\sqrt{3}}{4}$

(c) $\frac{1}{2}$

(d) $\frac{1}{8}$

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In a coil of resistance 10$\mathrm{\Omega }$, the induced

current developed by changing magnetic

flux through it is shown in the figure as a

function of time. The magnitude of change

in flux through the coil in weber is-

(a) 8

(b) 2

(c)6

(d)4

Concept Questions :-

AC vs DC
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In an AC circuit an alternating voltage  volt is connected to a capacitor  The $\mathrm{rms}$ value of the current in the circuit is

(a) 100 mA

(b) 200 mA

(c) 20 mA

(d) 10 mA

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The current  in a coil varies with time as shown in the figure. The variation of induced emf with time would be

(a)                                                                                         (b)

(c)                                                                                             (d)

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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 $3\mathrm{\Omega }$, the phase difference between the applied voltage and the current in the circuit is

(a) $\mathrm{\pi }/4$                                                 (b) $\mathrm{\pi }/2$

(c) zero                                                  (d) $\mathrm{\pi }/6$

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The rms value of potential difference V shown in the figure is

(a) ${\mathrm{V}}_{\mathrm{o}}$                                                     (b) $\frac{{\mathrm{V}}_{\mathrm{o}}}{\sqrt{2}}$

(c)$\frac{{\mathrm{V}}_{\mathrm{o}}}{2}$                                                     (d) $\frac{{\mathrm{V}}_{\mathrm{o}}}{\sqrt{3}}$

Concept Questions :-

Rms and average values
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A coil has resistance  and inductive reactance  at 50 Hz frequency. If an AC source of 200 V, 100 Hz, is connected across the coil, the current in the coil will be:

1.

2.

3. $\frac{20}{\sqrt{13}}\mathrm{A}$

4.

Concept Questions :-

Different types of AC Circuits
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In the given circuit the reading of voltmeter  are 300V each. The reading to the voltmeter ${V}_{3}$ and ammeter A are respectively :

(a) 150V, 2.2A                                              (b) 220V, 2.2A

(c) 220V, 2.0A                                              (d) 100V, 2.0A

Concept Questions :-

Different types of AC Circuits
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level: