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Syllabus

A cylindrical wire is stretched to increase its length by 10%. Calculate the percentage increase in its resistance.

Q. A coil of inductance L = 2.0 $\mu $H and resistance R = 1$\Omega $ is connected to an ideal source of constant emf $\epsilon $ = 3 V as shown in the figure. The amount of heat produced in the coil after the switch S is disconnected, is

(1) 1 $\mu $J

(2) 3 $\mu $J

(3) 10 $\mu $J

(4) 50 $\mu $J

what is wattless current?

what is the dimensional formulas of mutual inductance.

^{-11}, Farad, L = 10^{-5}Henry and R = 100 ohm, when a constant D.C voltage E is applied to the circuit, the capacitor acquires a charge $10\xb0C$. The D.C source is replaced by a sinusoidal voltage source in which the peak voltage E. At resonance the peak value of the charge acquired by the capacitor will be.$\left(A\right){10}^{-15}C\phantom{\rule{0ex}{0ex}}\left(B\right){10}^{-6}C\phantom{\rule{0ex}{0ex}}\left(C\right){10}^{-10}C\phantom{\rule{0ex}{0ex}}\left(D\right){10}^{-8}C$

Two bodies of masses m1 and m2 are connected by a light string which passes over a frictionless massless pulley . If the pulley is moving upward with uniform acceleration g/2 , then tension in the string is - 1) 3 m1 m2 g / m1 + m2 ..............2)m1 + m2 g / 4m1 m2 ..........3)2 m1 m2 g / m1 + m2 ..............4)m1 m2 g / m1 + m2 ..............

what is meant by sharpness of resonance?

define watt-less current?

Solve this :$8.\mathrm{If}\mathrm{current}{\mathrm{I}}_{3}=3\mathrm{A}\mathrm{sin}\mathrm{\omega t}\mathrm{and}{\mathrm{I}}_{2}=4\mathrm{A}\mathrm{cos}\mathrm{\omega t},\mathrm{then}{\mathrm{I}}_{3}\mathrm{is}:\phantom{\rule{0ex}{0ex}}\left(1\right)5\mathrm{A}\mathrm{sin}\left(\mathrm{\omega t}+53\xb0\right)\left(2\right)5\mathrm{A}\mathrm{sin}\left(\mathrm{\omega t}+37\xb0\right)\phantom{\rule{0ex}{0ex}}\left(3\right)5\mathrm{A}\mathrm{sin}\left(\mathrm{\omega t}+45\xb0\right)\left(4\right)5\mathrm{A}\mathrm{sin}\left(\mathrm{\omega t}+30\xb0\right)$

by I = (2 + 3 sin ωt) A, then the effective value of

resulting current in the circuit is

(1)(17/2)

^{1/2}ampere(2) (2/17)

^{1/2}ampere(3)(3/(2)

^{1/2})^{1/2}ampere(4) 3(2)

^{1/2}amperewhy is 220v ac more dangerous then 22ov dc?

Q.9. A Series LCR circuit is made by taking $R=100\Omega ,L=\frac{2}{\pi}H,C=\frac{100}{\pi}\mu F$. This series combination is connected across an AC source of 220 V, 50 Hz.

Calculate :

(i) the impedance of the circuit.

(ii) the peak value of the current flowing in the circuit.

(iii) the power factor of this circuit and compare this with the one at its resonant frequency.

[Ans. $100\sqrt{2}\Omega ,2.2A,\frac{1}{\sqrt{2}},\frac{1}{\sqrt{2}}$]

project to investigate the relation between the ratio of

1)output & input voltage

2)no. of turns in secondary & primary coil of a self designed transformer

what is power factor in an a.c. circuit?

plz answer this question :- A resistor of 200 ohm and a capacitor of 15 micro F are connected in series to a 220V, 50 Hz a.c. source . Calculate the current in the circuit and the r.m.s. voltage across the resistor and capacitor.

A series

LCRcircuit withL= 0.12 H,C= 480 nF,R= 23 Ω is connected to a 230 V variable frequency supply.(a)What is the source frequency for which current amplitude is maximum. Obtain this maximum value.(b)What is the source frequency for which average power absorbed by the circuit is maximum. Obtain the value of this maximum power.(c)For which frequencies of the source is the power transferred to the circuit half the power at resonant frequency? What is the current amplitude at these frequencies?(d)What is theQ-factor of the given circuit?through it and this current is in phase with the applied voltage. When another element Y is

connected across the same a.c. source, the same current flows in the circuit but it leads the

voltage by /2 radians.(i) Name the circuit elements X and Y. (ii) Find the current that flows

in the circuit when the series combination of X and Y is connected across the same a.c.

voltage.

For circuits used for transporting electric power, a low power factor implies large power loss in transmission.Explain.

full form of LCR circuit?

Q). In the above figure there is variation of an alternating voltage with time. What is the average value of the voltage for the shaded part of the graph ?

what is the definition of quality factor

an electron is moving at 10^6m/s in a direction parallel to 5A current flowing through na infinitely long straight wire separated by a perpendicaular distance of 10cm in air.calculate the magnitude of force experienced by the electron.

Power factor of an ac circuit is 0.5. What will be the phase difference between voltage and current in the circuit?

why does a capacitor block dc nd allows ac????

(i) Name the element X and Y.

(ii) Find the current that flows in the circuit when series combination of X and Y is connected across the same voltage.

(iii) Plot a graph showing variation of the net impedance of this series combination of X and Y as a function of the angular frequency of the applied voltage.

disconnected, and a 12 mH coil is connected in series with the capacitor

so that LC Oscillations occur. What is the maximum current in the coil?

Assume that the circuit has no resistance.

a bulb and a capacitor are connected in series to A.C.source of variable frequency.how will the brightness of the bulb change on increasing the frequency of the A.C. source? give reason for your answer.

The primary of a transformer has 200 turns and the secondary has 1000 turns. if the power output from the secondary at 1000V is 9kW, calculate

a. the primary voltage and

b. the heat loss in the primary coil if the resistance of primary is 0.2(ohm) if the efficiency of the transformer is 90%

wht is sharpness of resonance in series LCR- circuit ? a resistor of 200 ohm and capacitor of 15 muF

are connected in series 1:0 220V:50Hz ac sorce

a> calculate current in circuit

b>

calculate voltage across resistor and capacitor. is the algebric sum of these voltages more than sorce voltage if yes how?

When the capacitor is connected in series LR circuit, the alternating current flowing in the circuit increases. Explain why?

what do you mean by Q-factor and whats is its importance ?

ii. Calculate the value of additional capacitor which may be joined suitably to capacitor C that would make the power factor of the circuit unity.

Q. A 110 V, 60 W lamp is run from a 220 V AC mains using a capacitor in series with the lamp, instead of a resistor then the voltage across the capacitor is about:-

_{0}sin wt is applied across pure inductor. Obtain expression for current flowing in circuit. Hence write expression for instantaneous power supplied by voltage source to inductor. Show that average power supplied over a complete cycle is zero.Show that in the free oscillations of an LC circuit, the sum of energies stored in the capacitor and the inductor is constant in time.

what is the principle of METAL DETECTORS ?

An inductor 200 MH, capacitor 500µf, resistor 10Ω are connected in series with

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.

The primary coil of an ideal step up transformer has 100 turn and transformation

15.In the following circuit the emf of source is E_{0}=200V, R=20 $\Omega $, L=0.1 henry., C=10.6 farad and frequency is variable then the current at frequency f=0 and f = $\infty $ is(C) 10 A, 10 A (D) Zero, zero

A solenoid with an iron core and bulb are connected to a dc source. how does the brightness of the bulb change when the iron core is removed from the solenoid.??? its urgent

A variable frequency 230V ac voltage source is connected across a series combination of L=5H,R=40ohm,C=80uF.Calculate

(i)Angular frequency of the source which drives the circuit in resonance,

(ii)Amplitude of current at resonant frequency

(iii)r.m.s voltage across inductor at resonance

How does total impedence of a series LCR circuit change if the frequency of the applied a.c. supply is increased and why?

_{L}= R and power factor of the circuit is P_{1}. When a capacitor with capacitance C such that X_{L}= X_{C}is put in series, the power factor becomes P2. Find P_{1}/ P_{2}.When an alternating voltage of 220V is applied across a device X, a current of 0.5A

flows through the circuit and is in phase with the applied voltage. When the same

voltage is applied across another device Y the same current flows through the

circuit but it leads the applied voltage by /2 rad.

(a) Name the devices X and Y.

(b) Calculate the current flowing in the circuit when same voltage is applied across

the series combinations of X and Y.

Explain principle, working theory of Transformer.

A series LCR circuit is connected to an A.C source of voltage V and angular frequency w.(omega.) When only the capacitor is removed, the current lags behind the voltage by a phase angle 'phi' and when only the inductor is removed , the current leads teh voltage by tha same phase angle. Find the current flowing and the average power dissipated in teh LCR circuit.? Please REply fast Please.

$1)\frac{A}{a}\sqrt{\frac{2h}{g}}\phantom{\rule{0ex}{0ex}}2)\frac{a}{A}\sqrt{2gh}\phantom{\rule{0ex}{0ex}}3)\frac{a}{A}\sqrt{\frac{2h}{g}}\phantom{\rule{0ex}{0ex}}4)\frac{A}{a}\sqrt{\frac{g}{2h}}$

Q Bernoulli's equation is a consequence conservation of

in a series LCR circuit the voltages across an inductor,capacitor, n a resistor are 30V,30V n 60V respectively.wat is the phase difference b/w the applied voltage n current in the circuit.??

A sinusoidal voltage of peak value 283 V and frequency 50 Hz is applied to a series LCR circuit in which R = 3 W, L = 25.48 mH, and C = 796 μF.Find (a) the impedance of the circuit; (b) the phase difference between the voltage across the source and the current; (c) the power dissipated in the circuit; and (d) the power factor. In this question for finding P we use P=I^2 R and Irms=I/root2 but why do we divide 283 by 5?

Give principle construction working of AC generator.

_{o}_{0}sinwt.the variation of voltage,current and power in one complete cycle is shown in the following.which curve shows power consumption over a full cycle?identify the deviceX

A reactive element , in an AC circuit causes the current flowing.

1. To lead by pi by two

2. to lag in phase by pi by two w.r.t. the applied voltage

Identify the element in each case.

Experts, how to make an ac generator for my physics project? plzz help!!

1.0.00002

2.0.00004

3.0.00003

4.0.00006

_{2}°C and the room temperature is t_{1}°C. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be:(1) $\frac{{\mathrm{t}}_{2}+273}{{\mathrm{t}}_{1}-{\mathrm{t}}_{2}}$ (2) $\frac{\mathrm{t}{}_{1}+{\mathrm{t}}_{2}}{{\mathrm{t}}_{1}+273}$ (3) $\frac{{\mathrm{t}}_{1}}{{\mathrm{t}}_{1}-{\mathrm{t}}_{2}}$ (4) $\frac{{\mathrm{t}}_{1}+273}{{\mathrm{t}}_{1}-{\mathrm{t}}_{2}}$