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Subject: Physics, asked on 18/12/15

three students X,Y and Z performing an experiment for studying the variation of A.C with angular frequency in LCR circuit and obtained the graphs shown bellow. they all uses a.c source of r.m.s value and inductance of the same value . what can we (qualitatively ) conclude about the (i) capacitance value (ii) resistance value used by them ? in which case will the quality factor be maximum ? what can we conclude about the nature of the impendence of the set up frequency Wo

Subject: Physics, asked on 28/12/11

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

Subject: Physics, asked on 2/3/16

dimensional formula of root LC is

Subject: Physics, asked on 22/9/13

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

Subject: Physics, asked on 3/5/17

For the series LCR circuit shown in the figure! what is the resonance frequency and the amplitude of the current at the resonating frequency?

Subject: Physics, asked on 7/1/15

When a circuit element X is connected across an a.c. source, a current of √2A flows
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.

Subject: Physics, asked on 7/1/15

State which of the two, the capacitor or an inductor, tends to become a SHORT when the frequency of the applied alternating voltage has a very high value.

Subject: Physics, asked on 20/2/16

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

 
ratio is also 100. The input voltage and power are 220V and 1100W
 
respectively. Calculate
 
(a) The number of turns in secondary
 
(b) The voltage across the secondary
 
(c) The current in the secondary
 
(d) The current in the primary
 
(e) The power in the secondary

Subject: Physics, asked on 7/9/11

what is the principle of METAL DETECTORS ?

Subject: Physics, asked on 24/1/15

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

Subject: Physics, asked on 15/2/17

13) In a series LCR circuit, C = 10-11 , 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°C. 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.
(A) 10-15C(B) 10-6C(C) 10-10C(D) 10-8C

Subject: Physics, asked on 3/3/16

show that current leads the voltage in phase by pie/2 in an ac circuit containing an ideal capacitor

Subject: Physics, asked on 14/10/16

An AC voltage v= V0 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.

Subject: Physics, asked on 23/1/12

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

 
100V variable frequency ac source. Calculate.
 
1)Frequency at which power factor of the circuit is unity.
2)Q factor

Subject: Physics, asked on 13/9/14

Explain principle, working theory of Transformer.

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