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Syllabus

State the principal and working of a meter bridge?

On what factors the internal resistence of a cell depends ?

Q.53. In the circuit shown in figure, find the current through the branch BD.

(1) 1 A

(2) 5 A

(3) 3 A

(4) 7 A

Draw an equipotential surface due to an electric dipole.

why are alloys manganin constantan used to make standard resistance coil?

project onto study various factors on which the internal resistance/emf of a cell depends.

why is it safe to sit inside a car during a thunderstorm ?

Define 1 Ampere.

Q. For the circuit shown calculate the potential difference between point B and D.

derivation for ampere circuital law?

How to solve an unbalanced Wheatstone bridge?

1)60 W bulb will fuse. 2)100 W bulb will fuse 3)both bulbs will fuse.

4)Bulbs will not fuse

how can sensitivity of potentiometer be increased

34. Two cells of emf 4 V and 3 V having internal resistance of 3 ohm and 1 ohm respectively are connected in parallel so as to send a current through an external resistance of 5 ohm in the same direction. Find the current through the cells and the current through the external resistance.

35. A coil having an inductance of 200 mH and resistance 10 ohm is connected to a 220 V, 50 Hz ac supply. Calculate the (a) impedance of the circuit and (b) the current in the circuit.

36. Find the angle of minimum deviation produced by an equilateral prism of refractive index 1.55. Also find the angle of incidence of minimum deviation.

37. Obtain the amount (mass) of ${}_{27}C{o}^{60}$; (${T}_{1/2}$= 5.3years) necessary to provide a radioactive source of 5.0mCI

strength.

What is the dimensional formula of potential difference

in a meter bridge when the resistance in the left gap is 2ohm & an unknown resistance in the right gap, the balance point is obtained at 40cm from zero end. on shunting the unknown resistance with 2ohm, find the shifty of the balance point on the bridge wire.

What is the definition of meter bridge?

Using Kirchhoff’s Law determine the current I1, I2 and I3 for the network shown below:

What are the conditions for total internal reflection?

the emf of a cell is always greater than its terminal voltage.why?give reason.

why is potentiometer preferred over voltmeter?

Q.13. In given circuit, the potential at point A is

(1) 5 volt

(2) 0 volt

(3) 2.5 volt

(4) 4 volt

what is the dimension of resistance....????

a copper wire is streched to make it 0.1%lonnger.what is the percentage change in resistance?

(a) $\frac{1}{2}R$

(b) 2 R

(c) $\frac{5}{8}R$

(d) $\frac{8}{5}R$

what is vacus junction?

A balloon starts rising from ground rest with an upward acceleration 2 m/secsqu. just after 1 sec. a stone is dropped from it the time taken by stone to strike the ground is nearly?

How is I=Qv and I=QA please explain. these formulae have been used in my guide.

the resistance of the platinum wire of a platinum resistance thermometer at the ice point is 5 ohm and at steam point is 5.23 ohm .When the thermometer is inserted in a hot bath , the resistance of the platinum wire is 5.795 ohmcalculate the temprature of the bath

what are the advantages of potentiometer over votlmeter ?

show that electric field is conservative?

A 80uF capacitor is charged by a 50V battery.The capacitor is disconnected from the battery and then connected across another uncharged 320 uF capacitor. Calcuulate the charge on the second capacitor.

the reading on a high resistance voltmeter when a cell is connected across it is 2.2 v . When the terminal of the cells are also connected to a resistance of 5 v ,the voltmeter reading drops to 6.8 v . Find the internal resistance of the cell?????The cell has an emf of 2 V and the internal resistance of this cell is 0.1 ohm. It is connected to resistance of 3.9 ohm. What will be The voltage across the cell?

Three cells of emf 2V,1.8V and 1.5V are connected in series.Their internal resistances are 0.05ohm, 0.7ohm and 1ohm respectively.If the battery is connected to an external resistor of 4ohm via a very low resistance of ammeter, what would be the reading in the ammeter?

In a galvanometer there is deflection of 10 divisions per mA.Thje internal resistance of the galvanometer is 60 ohm.If a shunt of 2.5 ohm is connected to the galvanometer and there are 50 divisions in all,on the scale of galvanometer,what maximum current can this galvanometer read?

MY DOUBT IS:(If wrong plz correct it and explain) Since there are 50 divisions in all in the galvanometer,then maximum current that galvanometer would read is I_{g}=50*1/10=5 mA .But the answer is given 125 mA.How?how does drift velocity of electron in a metallic conductor vary with temperature?

The deflection 'theta' produced in a galvanometer is reduced to 45 divisions from 55 divisions, when a stunt of 8 ohm is used. Calculate the resistance of Galvanometer?

A steady current flows in a metallic conductor of non-uniform cross section.Which of these quantities is constant along the conductor-

1)Current

2)Current density

3)Drift speed

4)Electric field

derive relation between current density and potential difference across a current carrying conductor of length l,area of cross section A and number density of free electron n

A resistance or R ohm draws a current from a potentiometer.The potentiometer has a total resistance R

_{0}ohm.A voltage V is supplied to the potentiometer .Derive an expression for the voltage fed to the ckt when the slide is in the middle of the potentiometer.A wire of resistance 8R is bent in the form of a circle. What is the effective resistance between the ends of a diameter AB?

Calculate the de-Broglie's wavelength associated with an electron of energy 200eV .What will be the change in its wavelength if the accelerating potential is increased to four times its earlier value?

Explain the variation of conductivity nwith temp for (a) A metallic conductor (b) ionic conductor

Specific resistances of Copper,silver and constantan are 1.18 x 10-6 ohm cm,1 x 10-6 ohm cm,and 48 x 10-6 ohm cm resp.

Whic is the best electrical conductor and why?

Two conducting wires X and Y of same diameter but different material are joined in series across the battery. If the number density of electron in X is twice that in Y, fined ratio of drift velocity of electron in two wires

If a wire is stretched to double its original length without loss of mass,how will resistivity of the wire be influenced?

a uniform wire of resistance 36 ohm is bent in tne form of a circle .calculate the effective resistance across the points A and B.

(THE QUESTION IS FROM HEATING EFFECT OF CURRENT)

(MERITNATION EXPERT PLEASE ANSWER)

Two bulbs B1 and B2 are connected in series with an A.C source of emf 200V as shown.The labels on the bulbs reads 200V-60W and 200V-100W respectively .Calculate the ratio of the (a)the resistance of the bulb (R1/R2) (b) the power being consumed when connected in series (P1/P2) (c)the p.d across the bulbs (V1/V2)

(ans a,b,c =5:3)please make it simple,short,and undrstndn

is current is scalar or vector quantity?

_{1}and R_{2}extends off to infinity to the right. Find the equivalent resistance.The supply voltage to a room is 120V.The resistance of lead wires is 6 ohm.A 60 W bulb is already switched on.What is the decrease of voltage across the bulb when a 240 W heater is switched on in parallel with the bulb?

a)0 V b)2.9 V c)13.3 V d) 10.04 V

My Question:

Draw V-I Graph for both ohmic and non-ohmic materials stating one example of each as well.thanks!

Q. Find the current through the 10 ohm resistance connected across AB.

a wire of 15 ohm resistance is gradually stretched to double its original length. it is then cut into two equal parts. these parts are connected in parallel across a 3 V cell. find the current drawn from the cell

1)[L]^3 2)[LT^-2] 3) [ML^-3] 4)[ ML^-1T^-3]

A storage battery of emf 8V and internal resistance 0.5 ohm is being charged by a 120 V d.c supply using a series resistor of 15.5 ohm. What is the terminal voltage of the battery during charging? what is the purpose of having a series resistor in the charging ciruit?

12 identical resistance R each form a cube . Resistance across its face diagonal corners is?

A 40W-110V bulb is to be used with 220V-50Hz AC.Calculate the inductance required for this purpose.

or

(c) In a diffraction phenomenon, radius of the central bright region is given as ${\mathrm{r}}_{0}=\frac{1.22\mathrm{\lambda f}}{2\mathrm{a}}$

$\mathrm{where}\mathrm{\lambda}\mathrm{is}\mathrm{wavelength}\mathrm{of}\mathrm{the}\mathrm{light},\mathrm{f}\mathrm{is}\mathrm{the}\mathrm{focal}\mathrm{length}\mathrm{of}\mathrm{the}\mathrm{lens}\mathrm{used}\mathrm{and}2\mathrm{a}\mathrm{is}\mathrm{the}\phantom{\rule{0ex}{0ex}}\mathrm{diameter}\mathrm{of}\mathrm{the}\mathrm{aperture}.\mathrm{Show}\mathrm{that}\mathrm{in}\mathrm{order}\mathrm{to}\mathrm{observe}\mathrm{two}\mathrm{objects}\mathrm{clearly}\mathrm{by}\mathrm{a}\mathrm{microscope},\phantom{\rule{0ex}{0ex}}\mathrm{the}\mathrm{minimum}\mathrm{separation}\mathrm{between}\mathrm{them}\mathrm{must}\mathrm{be}\frac{1.22\mathrm{\lambda}}{2\mathrm{sin\beta}}\mathrm{where}\mathrm{\beta}\mathrm{is}\mathrm{the}\mathrm{angle}\mathrm{between}\mathrm{principal}\phantom{\rule{0ex}{0ex}}\mathrm{axis}\mathrm{of}\mathrm{the}\mathrm{objective}\mathrm{and}\mathrm{the}\mathrm{ray}\mathrm{of}\mathrm{light}\mathrm{from}\mathrm{the}\mathrm{object}\mathrm{to}\mathrm{the}\mathrm{apex}\mathrm{of}\mathrm{the}\mathrm{lens}.$

or

$\mathrm{A}\mathrm{beam}\mathrm{of}\mathrm{light}\mathrm{consisting}\mathrm{of}\mathrm{wavelengths}6500\dot{\mathrm{A}}\mathrm{and}5200\dot{\mathrm{A}}\mathrm{is}\mathrm{used}\mathrm{in}\mathrm{Young}\text{'}\mathrm{s}\mathrm{double}\mathrm{slit}\phantom{\rule{0ex}{0ex}}\mathrm{experiment}\mathrm{of}\mathrm{slit}\mathrm{separations}2\mathrm{mm}\mathrm{and}\mathrm{where}\mathrm{the}\mathrm{screen}\mathrm{is}120\mathrm{cm}\mathrm{away}.\mathrm{Find}\mathrm{the}\mathrm{distance}\phantom{\rule{0ex}{0ex}}\mathrm{to}\mathrm{the}\mathrm{third}\mathrm{fringe}\mathrm{from}\mathrm{the}\mathrm{central}\mathrm{maximum}\mathrm{for}\mathrm{the}\mathrm{wavelength}6500\dot{\mathrm{A}}.\mathrm{What}\mathrm{is}\mathrm{the}\mathrm{least}\phantom{\rule{0ex}{0ex}}\mathrm{distance}\mathrm{from}\mathrm{the}\mathrm{central}\mathrm{maximum}\mathrm{at}\mathrm{which}\mathrm{the}\mathrm{bright}\mathrm{fringes}\mathrm{due}\mathrm{to}\mathrm{both}\mathrm{wavelengths}\phantom{\rule{0ex}{0ex}}\mathrm{coincide}?$

Draw the circuit diagram and using Kirchhorf's laws, calculate the current through each branch of the circuit and potential difference across the 5 ohm resistor.

Example 138. using Kirchhoff's laws in the electrical network shown in Fig. 3.148, calculate the values of ${I}_{1},{I}_{2}and{I}_{3}$.

derive the expression for drift velocity in an electric field.

what are kirchhoff's law?explain them.

give two possible causes for one sided deflection in a potentiometer experiment.

why is a copper wire used in a sonometer to find the frequency of A.C mains?plz i hv my board practicals 2morow.friends and xperts plz help

1 NEWTON =how many dyne?

the resistance of a silver wire at 0 degree celsius is 1.25 ohm.upto wat temp. it must b heated so dat its resistance is doubled?(alpha silver=0.00375/degree celsius.will d temp. be same for all silver conductors of all shapes??

1)Each bulb is 200V

2)100W bulb is greater than that across 60W bulb

3)100W bulb is smaller than that across 60W bulb

4)Each bulb is 100V

A cylindrical metallic wire is stretched to increase its length by 5%. Calculate the percentage change in its resistance.

what is the main difference between DC n AC current???

A potential diffrence of 200 Volt is applied to a coil at a temperature of 15

^{.}C and the current is 10 Ampere. What will be the temperature of the coil when the current ha fallen to 9 Ampere, the applied voltage being the same as before ? AndTemperature coffiecient of resistance (Alpha) = 1 / 234

^{.}C^{-1}