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Subject: Physics, asked on 25/2/18

Pls solve n send asap
Q. Draw a schematic sketch of an AC generator discussing its basic elements and state its principle. An alternating voltage V = 10 Sin 300 t volt is applied across an inductor of 2 henry. Find reactance given by the inductor and RMS current through the inductor.

Subject: Physics, asked on 24/2/18

Question) In a series LCR circuit  connected to an a.c. source of voltage v = vm sin ωt, use phasor diagram an expression for the current in the circuit. Hence obtain the expression for the power dissipated in the circuit, Show that the power dissipated at resonance is maximum.

Subject: Physics, asked on 23/2/18

solve 23

Subject: Physics, asked on 20/2/18

discuss the series resonant circuit derive an expression for resonant frequency and show a geographical variation between current and angular frequency of applied ac​

Subject: Physics, asked on 19/2/18


Q. ​A device 'X' is connected to an ac source V = V0 sin ωt. The variation of voltage, current and power in one cycle is shown in the following graph : 
 
a. Identify the device X. 
b. Which of the curves A, B and C represent the voltage, current and the power consumed in the circuit? Justify your answer. 
c. How does its impedance vary with frequency of the ac source ? 
Show graphically. 
d. Obtain an expression for the current in the circuit and its phase relation with ac voltage. 

Subject: Physics, asked on 18/2/18

small dc motor operates 110 volt.what is back emf in it

Subject: Physics, asked on 18/2/18

A series L.C.R circuit is connected to an AC source .Using the phase diagram derive the expression for the impedance of the circuit .plot a graph to show the variation of the current with frequency of the source explain nature of variation

Subject: Physics, asked on 18/2/18

Show that the current leads to the voltage in phase by pie/2 in a A.C circuit containg an ideal capacitor and also show that the average power supplied by the source over a complete cycle is 0 in the circuit.

Subject: Physics, asked on 18/2/18

Ques 23

Subject: Physics, asked on 18/2/18

Ques 4 and ques 5
Q.4. How can the rms voltage of an ac circuit be non zero when its average value is zero? Explain.
Q.5. Why are alloys used for making standard resistance coils?

Subject: Physics, asked on 15/2/18

Pls solve this
Q. A lamp consumes only 50 % of peak power in an a.c. circuit. What is the phase difference between the applied voltage and the circuit current
a) π6
b) π3
c) π4
d) π2
 

Subject: Physics, asked on 13/2/18

State the principle and working of a transformer

Subject: Physics, asked on 10/2/18

Please show me the steps how to solve

(1)    The equation of a simple harmonic progressive wave is given by y =4 sin π t0.02- x75 cm. Find the displacement and velocity of the particle at a distance of 50 cm from the origin and at the instant 0.1 second (all quantities are in c.g.s. units)

                                                                                                                  (Ans : Displacement = 3.464 cm,
                                                                                                                ​Velocity of the particle = 3.14 m/s)

Subject: Physics, asked on 10/2/18

In a series LR circuit XL = R and power of the circuit is P1. When a capacitor with capacitance C, such that XL = XC is put in series, the power factor becomes P2. Calculate Pl/P2.

Subject: Physics, asked on 7/2/18

Solve 20,21,22,23,24,25&26

23456
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