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Syllabus

State the principal and working of a meter bridge?

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??

On what factors the internal resistence of a cell depends ?

Draw an equipotential surface due to an electric dipole.

please answer all of them. they are from meter bridge experiment class 12

2. If the metre bridge wire is not of uniform area of cross section,

how will it affect the observations?

Fig. E 2.3 Defective scale of a metre bridge

3. If the metre bridge wire is not made of a material of uniform density,

how will it affect the observations?

4. If the same experiment is performed with AC = 50 cm wire instead

of 1 m, what changes would be there in the result?

5. The scale attached along the wire may not indicate the exact

length as shown in Fig. E 2.3. How would you minimise the error?

6. Why is the metre bridge not suitable for measuring very

high/very low resistances?

7. Why is the metre bridge preferred for determining the resistanceof a wire over the Ohms law circuit

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

why do we perfer a 10 wire potentiometer to 4 wire potentiometer ?

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

Potential difference accross the terminals of a non ideal battery is :-

(A) zero when it is short circuited

(B) less than its emf when current flows from negative to positive terminal inside the battery

(C) zero when no current is drawn from the battery

(D) greater than its emf when current flows from positive to neagtive terminal inside the battery.

Define 1 Ampere.

derivation for ampere circuital law?

what is the significance of direction of electric current

How to solve an unbalanced Wheatstone bridge?

Emf of a cell is 1.5V and its internal resistance is 1ohm.For what current drawn from the cell will the terminal potential difference be half of its emf?

how can sensitivity of potentiometer be increased

(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

What is the dimensional formula of potential difference

a copper conductor of length 10cm and radius 1.5mm is connected in parallel to an ammeter having a resistance of 0.03ohm. find the current in the circuit if the ammeter indicates 0.4A . the resistivity of copper is 1.78 * 10^{-8 .}What is the definition of meter bridge?

(1).Diode

(2).Thyristor

(3).PN junction system

(4).All of these

What are the conditions for total internal reflection?

A 3 m long copper wire carrying a current of 3 A.. How long does it take for an electron to drift from one end to other end ? The cross- sectional area of the wire is 2 * 10 ^ -6 m

^{2}and the number of conduction electrons in copper is 8.5 * 10 ^ 28 m^{-3}.the emf of a cell is always greater than its terminal voltage.why?give reason.

why should materialof potentiometer wire be of high specific resistance?

why is potentiometer preferred over voltmeter?

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

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

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

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?

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

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

what are the advantages of potentiometer over votlmeter ?

show that electric field is conservative?

Why are you advised not to drag the jockey hard on the metre bridge wire while determining the null point?

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?????53. Figure shows a circuit with known resistance R

_{1}& R_{2}. Neglect the internal resistance of the sources of the current and resistance of the connecting wire. The magnitude of electromotive force E_{1}such that the current through the resistance R is zero will be.$a)E{R}_{1}/{R}_{2}B)E{R}_{2}/{R}_{1}C)\frac{E({R}_{1}+{R}_{2})}{{R}_{2}}D)\frac{E{R}_{1}}{\left({R}_{1}+{R}_{2}\right)}$

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

4)Bulbs will not fuse

Ans 200 ohm,5*10^-3 A.

Dont give link.

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?2 cells A and B each having e.m.f 1.5v and int. resistances of 1.5ohm and 0.5ohm respectively,are joined in parallel with a 1ohm resistor.calculate currents drawn from the cell and their terminal p.d.'s

how does drift velocity of electron in a metallic conductor vary with temperature?

_{1}and R_{2}extends off to infinity to the right. Find the equivalent resistance.Why potentiometer is most accurate device to measure emf of a cell?

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

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.The resistance of a silver wire at 0 degree c is 1.25 ohm . Up to what temperature it must be heated so that its resistance is doubled ? The temperature coefficient of resistance of silver is 0.00375 degree c^-1 . Will the temperature be the same for all conductors of silvers ?

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?

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

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 resistance of a silver wire at 0 degree c is 1.25 ohm . Up to what temperature it must be heated so that its resistance is doubled ? The temperature coefficient of resistance of silver is 0.00375 degree c^-1 . Will the temperature be the same for all conductors of silvers ?

is current is scalar or vector quantity?

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!

_{2}He^{4}) is revolving in a circular orbit of radius 3.14A with speed of 8*10^{6}m/s .then the equivalent current is ?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

An electric kettle was marked 500 watts, 230volts and was found to bring 1kg of water at 15 degree centigrade to boiling point in 15 minutes. Determine the heat efficiejncy of the kettle.

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?

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.

80. There are 32 cells each having emf 1 V and internal resistance 1 $\Omega $. All the cells are connected together in a closed loop. When terminal voltage of cells are measured, they are found to be either 0.5V or 1.5 V. How many cells are having their polarities reserved with respect to the majority of cells?

(1) 6 (2) 12

(3) 8 (4) 10

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.

(a) 12 V (b) 13 V (c) 16 V (d) 18 V

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) 1 km (2) $\frac{1}{\sqrt{2}}\mathrm{km}$ (3) $\sqrt{2}\mathrm{km}$ (4) $2\sqrt{2}\mathrm{km}$

1 NEWTON =how many dyne?

The ratio of drift velocity to that of the thermal velocity of an electron in an conductor is -------------------------

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???