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Syllabus

State the principal and working of a meter bridge?

On what factors the internal resistence of a cell depends ?

Draw an equipotential surface due to an electric dipole.

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

(a) What is the emf of each cell used?

(b) For what current from the cell, does maximum power dissipation occur in the circuit?

(c) Calculate the internal resistance of each cell.

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

Define 1 Ampere.

Iflowing through the cross-section of a wire versus the timet. Use the plot to find the charge flowing in 10 sec through the wire.derivation for ampere circuital law?

How to solve an unbalanced Wheatstone bridge?

(i) terminal voltage V and

(ii) the current I,

as a function of R

how can sensitivity of potentiometer be increased

What is the dimensional formula of potential difference

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

What is the definition of meter bridge?

the potential drop per unit length of the wire.

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?

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

7. The reading of the (ideal) ammeter , in the circuit shown here , equals

(i) I when key K

_{1}â€‹ is closed but key K_{2}â€‹ is open.(ii) I/2 when both keys K

_{1 and }K_{2}_{â€‹}is closedFind the expression for the resistance of X in terms of the resistances of R and S.

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

Q12. For the circuit shown here, would the balancing length increase, decrease or remain the same, if

(i) R1 is decreased

(ii) R2 is increased

without any other change, (in each case) in the rest

of the circuit. Justify your answers in each case.

what is vacus junction?

l).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?

what are the advantages of potentiometer over votlmeter ?

an electric motor operating on a 50v d.c supply draws a current of 12 a if the efficiency of the motor is 30% estimate the resistance of the winding motor.

show that electric field is conservative?

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?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 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

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

4)Bulbs will not fuse

_{1}and R_{2}extends off to infinity to the right. Find the equivalent resistance.how does drift velocity of electron in a metallic conductor vary with temperature?

In an experiment on metre bridge, if the balancing length AC is 'x' . What would be its value, when the radius of the metre bridge wire AB is doubled? Justjfy the answer.

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

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

a) use kirchhoff's rules , calculate the current in the arm AC of the given circuit. (b) on what principle does the metre bridge work? why are the metal strips used in the bridge ?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?

i) What will one observe when switch (S) is closed?

ii) How will the glow of the bulb change when the battery is replaced by an ac source of rms voltage equal to the voltage of DC battery? Justify your answer in each case.

OR

An electric lamp having coil of negligible inductance connected in series with a Capacitor and an AC source is glowing with certain brightness. How does the brightness of the lamp change on reducing the (i) capacitance, and (ii) the frequency of ac voltage?

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

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

is current is scalar or vector quantity?

thet 3 identical resistors R1,R2 and R3 are connected to a battery as shown in the fig. what wil b d ratio of voltages across R1 andR2?

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.

Q. With the help of graphs, show, how resistivity changes with temperature in the cases of (i) Copper, (ii) Nichrome and (iii) Semiconductor.

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!

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

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?

Solve this :In the circuit given below , find the potential difference between A and B.

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

A micro-ammeter has a resistance of 100 Ohm anf full scale range of 50micro Ampere. It can be used as a voltmeter and an ammeter of a higher range provided a resistance is added to it. Pick the correct range and resistance combination(s) :-

(A) 50 V range & 10 kilo Ohm resistance in series

(B) 10 V range & 200 kilo Ohm resistance in series

(C) 5 mili ampere with 1 ohm resistance in parallel

(D) 10 mili ampere range with 1 Ohm in parallel

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.

(I) the emf and

(ii) the internal resistance of the cell.

derive the expression for drift velocity in an electric field.

(i) Energy stored in $12\mu F$ capacitor.

(ii) Energy stored in $3\mu F$ capacitor.

(iii) Total energy drawn from the battery.

what are kirchhoff's law?explain them.

In the given circuit, assuming point A to be at zero potential, use Kirchhoff's rules

to determine the potential at point B. 2

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

Q.(ii). The current is drawn from a cell of emf E and internal resistance r connected to the network of resistors each of resistance r as shown in the figure. Obtain the expression for (i) the current draw from the cell and (ii) the power consumed in the network.

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?

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

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

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

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

resistance of the driver cell increases and (ii) the series resistor connected to the

driver cell is reduced ? Justify your answer.