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Syllabus

State the principal and working of a meter bridge?

On what factors the internal resistence of a cell depends ?

Consider the circuit shown in the figure .Capacitors A and B ,each have capacitance C=2 F .The plates of capacitor A are shorted using a wire of resistance R =1 ohm while the left plate of capacitor B is given an initial charge Q=+4C.The switch is closed at time t=0.What will be the initial current drawn from the battery immediately after the switch is closed?Draw an equipotential surface due to an electric dipole.

(i) terminal voltage V and

(ii) the current I,

as a function of R

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

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

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

Define 1 Ampere.

16.A horizontal heavy uniform bar of weight W is supported at its ends by two men. At the instant, one of the man lets go off his end of the rod, the other feels the force on his hand changed to$\left(1\right)W\left(2\right)\frac{W}{2}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{3W}{4}\left(4\right)\frac{W}{4}$

derivation for ampere circuital law?

How to solve an unbalanced Wheatstone bridge?

current density and number of free electrons per unit volume

answer-

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

n=8.8*10^28

how can sensitivity of potentiometer be increased

1 km wide is

(1) 30 min

(2) 1 hr

(3) 2 hrs

(4) 20 min

What is the dimensional formula of potential difference

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

Dont give link.

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.

why is potentiometer preferred over voltmeter?

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

what are the advantages of potentiometer over votlmeter ?

show that electric field is conservative?

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

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

4)Bulbs will not fuse

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

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

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

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

A 15 Ω resistance is connected in the left gap and an unknown resistance less than 15 Ω is connected in the right gap of a metre bridge. When the resistances are interchanged, the balance point is found to shift by 20 cm. The unknown resistance is

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

four cells in a battery , each of internal resistance 0.8 ohm and emf 1.4V are connected (a) in series , (b) in parallel . the terminals of the battery are joined to to a lamp of resistance 10 ohm. find the current through thelamp and the cell in each case.

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 conductors one having resistance R and another 2R are connected in turn across a d.c.source.If the rate of heat produced in two conductors is Q

_{1}and Q_{2 }respectively, what is the value of Q_{1}/Q_{2}?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.

(i) the potential gradient along the wire.

(ii) p.d. between the ends of the wire.

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

how does internal resistance of a cell vary with temperature? pls answer me.

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?

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?

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.

(a) 40 cm

(b) 20 cm

(c) 300/7 cm

(d) 240/7 cm

derive the expression for drift velocity in an electric field.

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?

what are kirchhoff's law?explain them.

using the principle of wheatstone bridge, describe the method to determine the specific resistance of a wire in the laboratory. Draw the circuit diagram and write the formula used.

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

Ms Udaya joined a PG course in Nanotechnology lab in IIT Chennai. The

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

An electrical coil is connected in series with resistance of X ohm across the 240 volt mains .the coil being immersed in 1kg at 20degreeC .The temperature of water rises to boiling point in 10 minutes..when a second heating experiments is made with the resistance X short circuited.the time required to develop the same quantity of heat is reduced to 6 minutes.calculate the value of X.

1 NEWTON =how many dyne?

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

(i)What is the purpose of using high resistance R2?

(ii) How does the position of balance point (J) change when the resistance R1 is decreased?

(iii) Why cannot the balance point be obtained

(1) when the emf E is greater than 2V and

(2) when key (K) is closed?

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