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Syllabus

State the principal and working of a meter bridge?

= 80 cal and W_{iaf}_{iaf}= 50 cal. If W = – 30 cal for the curved pathfi, value of Q for pathfi, will be(1) 60 cal (2) 30 cal (3) –30 cal (4) – 60 cal

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?

what is the work done in moving a 2 micro coulomb point charge from corner A to corner B of a square' when a 10 mc charge exists at the centre of a square?

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?

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

What is the dimensional formula of potential difference

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?

find the relaxation time for free electrons in copper if the density of free electrons is 8.4 x 10^28 m^-3 given that resistivity of copper at room temperature = 1.7 x 10^-8 ohm m mass of electrons = 9.1 x 10^-31 kg and charge of electron = 1.6 x 10^-19 coulomb. please help.

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

76. A simple potentiometer circuit is shown in figure. The internal resistance of 4 V battery is negligible. AC is the uniform wire of length 100 cm and resistance 2 â„¦. What would be the length of AB for which galvanometer shows zero deflection.

(3) 165 cm (4) 50 cm

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

Q.73. In the following circuit if ${V}_{A}-{V}_{B}$ = 4 V, then the value of resistance X in ohms will be :-

(1) 5

(2) 10

(3) 15

(4) 20

what is vacus junction?

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

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 ?

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

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. Remains constant

b. Continuously increases

c. Continuously decreases

d. Data insufficient

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.3. Current through wire XY of circuit shown is

(a) 1 A

(b) 4 A

(c) 2 A

(d) 3 A

(1) 1.7 R

(2) 3.25 R

(3) 2.5 R

(4) 4.2 R

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

$a)i=3.4\times {10}^{-17}AfromAtoB\phantom{\rule{0ex}{0ex}}b)i=2.4\times {10}^{-17}AfromAtoB\phantom{\rule{0ex}{0ex}}c)i=3.4\times {10}^{-17}AfromBtoA\phantom{\rule{0ex}{0ex}}d)Noneoftheabove$

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?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?

10. In the adjacent circuit, AB is a potentiometer wire of length 40 cm and resistance per unit length 50 $\Omega /m.$ As shown in the figure, the free end of an ideal voltmeter is touching the potentiometer wire. What should be the speed of the jockey as a function of time so that reading in the voltmeter varies with time as $\left(2\mathrm{sin}\mathrm{\pi t}\right)?$

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?

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.

24. In the given figure, if galvanometer shows null deflection then emf of each cell will be [Total length of wire is 10 m and resistance is 9 $\Omega $]

(1) 9 V (2) 0.9 V

(3) 4.5 V (4) 1.8 V

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

$\left[{X}_{CM}=\frac{3AL+2B{L}^{2}}{3\left(2A+BL\right)}\right]$

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

^{-6}ohm - m. Calculate its resistance across its square surfaces.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.

derive the expression for drift velocity in an electric field.

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

what are kirchhoff's law?explain them.

Q.23. What will be the value of maximum acceleration of the truck in the forward direction so that the block kept on the back does not topple?

(1) ag/h

(2) hg/a

(3) ag/2h

(4) h/bg

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?

potentiometer wire, is k volt/cm and the ammeter, present in the circuit, reads

1.0 A when two way key is switched off. The balance points, when the key

between the terminals (i) 1 and 2 (ii) 1 and 3, is plugged in, are found to be at

lengths l1 cm and l2 cm respectively. The magnitudes, of the resistors R and X, in ohms,

are then, equal, respectively, to:

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???