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

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.

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

Define 1 Ampere.

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?

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

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

What is the dimensional formula of potential difference

_{1}and R_{2}extends off to infinity to the right. Find the equivalent resistance.What is the definition of meter bridge?

What are the conditions for total internal reflection?

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

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 is potentiometer preferred over voltmeter?

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

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

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

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

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

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 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 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

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 ?

1)9mewA. 2)zero 3)18mewA 4)12mew A

show that electric field is conservative?

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?????A. Straight line

B. Hyperbola

C. Parabola

D. circle

Explain pls?

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

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 the balancing point of wheatstone bridge get affectde1. position of cell and galvanometre are interchanged

2. position of known and unknown resistance is interchanged

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

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.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

what is the least count of galvanometer and ammeter ?how will we able to find it ?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.

(i) terminal voltage V and

(ii) the current I,

as a function of R

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

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

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

Dont give link.

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?

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

why do we exchange the positions of resistance box and unknown resistance in meter bridge experiment??

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.

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

derive the expression for drift velocity in an electric field.

what are kirchhoff's law?explain them.

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

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.

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

The potential difference between the terminals of a battery of emf = 10 V and internal resistance 1 Ohm drops to 9.8 V when connected accross an external resistance. The resistance of the external resistor is

(A) 49 Ohm

(B) 25 Ohm

(C) 31 Ohm

(D) 43 Ohm

1 NEWTON =how many dyne?

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???

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.