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Syllabus

State the principal and working of a meter bridge?

1) 1.5

2) 2.5

3) 3.0

4) 4.5

On what factors the internal resistence of a cell depends ?

Q. In the situation shown, the 2 $\mu $f is initally charged to 3V with polarity shown. When the switch S is closed, the capacitors start to charge and reach the steady state. (4 $\mu $f capacitor is initially uncharged). Find the thermal energy in the circuit after switch is closed.

Draw an equipotential surface due to an electric dipole.

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

current density and number of free electrons per unit volume

answer-

current density=2.4*1)^5A/m square

n=8.8*10^28

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

Define 1 Ampere.

derivation for ampere circuital law?

How to solve an unbalanced Wheatstone bridge?

how can sensitivity of potentiometer be increased

two cells of emf 6v and 12v and internal resistance 1ohm and 2ohm respectively are connected in parallel so as to send a current in the same direction through an ext . resistence of 15ohm.using kirchhoff's law calculate curent through each branch of the circuit and p.d. across 15onm resistor

What is the dimensional formula of potential difference

(i) terminal voltage V and

(ii) the current I,

as a function of R

What is the definition of meter bridge?

_{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 ?What are the conditions for total internal reflection?

If V is p.d across the potentiometer of length

l,then the potential drop per unit length of wire is given by(A) V

l(B) Ir

(C) IR

(D) I/R

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

IN COPPER ,THERE ARE 10

^{ 22 }FREE ELECTRONS PER C.C., ALL OF WHICH CONTRIBUTES TO CURRENT OF 1 A IN A WIRE OF COPPER OF 0.01 cm^{2}CROSS-SECTIONAL AREA.WHAT IS THE ELECTRIC FIELD IN THE WIRE?THE RESITIVITY OF COPPER IS 1.6*10^{-8 }OHM/m.why is potentiometer preferred over voltmeter?

length of a conductor is increased to 3 times what is the effect on

a. drift speed of electrons

b. resistance

c. resistivity

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

1. the current I2 in the arm EF

2. the voltage drop across the unknown resistance R

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

what is vacus junction?

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

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

what are the advantages of potentiometer over votlmeter ?

show that electric field is conservative?

Help pls!

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?????Then (1) x = y = z (2) x > y > z (3) y > z > x (4) x > z > y

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

4)Bulbs will not fuse

11. An uncharged capacitor C , Resistances R

_{1}= R and R_{2}= 2R. cells of emf $\epsilon $_{2}=$\epsilon $ and $\epsilon $_{2}= $\epsilon $ are connected as shown in the figure. Switch S is initially connected to terminal 1 for a long time and then it is connected to terminal 2 for an another long duration. jf H_{1}, U_{1}are the heat energies lost through the resistor R_{1}and energy stored in the capacitor respectively at steady state, when the switch is connected to terminal 1 and H_{2}, U_{2 }are corresponding value when the switch is connected to terminal 2 . Choose the correct statement (S).$\left(\mathrm{A}\right)\hspace{0.17em}\frac{{\mathrm{U}}_{1}}{{\mathrm{U}}_{2}}=1\left(\mathrm{B}\right)\hspace{0.17em}\frac{{\mathrm{H}}_{1}}{{\mathrm{H}}_{2}}=\frac{1}{4}\phantom{\rule{0ex}{0ex}}\left(\mathrm{C}\right)\mathrm{Work}\mathrm{done}\mathrm{by}\mathrm{the}\mathrm{cells}\mathrm{during}\mathrm{the}\mathrm{time}\mathrm{interval}\mathrm{when}\mathrm{they}\mathrm{are}\mathrm{active},\mathrm{is}\mathrm{positive}.\phantom{\rule{0ex}{0ex}}\left(\mathrm{D}\right)\mathrm{None}\mathrm{of}\mathrm{the}\mathrm{above}.$

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?^{20}electrons passes from point X toward another point Y in 0.1s . how much is the current ?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?

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 cells of emf 1.5 V and 2V and internal resistances 1 Ohm nd 2Ohm resp.are connected in parallel so as to send current in same diarection through external resistance of 5Ohm

1>using kirchoof's rule calculate current from each branch of cicuit

.2>pot. diff . across 5Ohmresistance

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.

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.

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!

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?

If the combination is connected to a battery of emf12 V and negligible internal resistance< calculate the potential drop across each resistor.

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

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

24.Calculate the value of current I_{1}, I_{2}and I_{3}in the circuit given below using Kirchhoff's law.1 NEWTON =how many dyne?

Q). Draw graphs showing dependence of F on

(i) ${I}_{1}{I}_{2}$ when d is kept constant

(ii) d when the product ${I}_{1}{I}_{2}$ is maintained at a constant positive value.

(iii) d when the product ${I}_{1}{I}_{2}$ is maintained at a constant negative value.

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???