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Syllabus

State the principal and working of a meter bridge?

1. 1A, 0A, 1A

2. 2A, 1A, 1A

3. 1A, 0.5A, 0.5A

4. None of these

On what factors the internal resistence of a cell depends ?

Calculate the de-Broglie's wavelength associated with an electron of energy 200eV .What will be the change in its wavelength if the accelerating potential is increased to four times its earlier value?

Draw an equipotential surface due to an electric dipole.

_{1}and R_{2}extends off to infinity to the right. Find the equivalent resistance.why are alloys manganin constantan used to make standard resistance coil?

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}.$1.10\Omega 2.5\Omega 3.40\Omega 4.15\Omega $

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

Define 1 Ampere.

derivation for ampere circuital law?

_{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 ?How to solve an unbalanced Wheatstone bridge?

A 200-V bulb takes a current of 0.2 A. The length of its filament is 22 cm and the specific resistance of the material of the filament is 7 * 10^-5 ohm-cm. Find the radius of the filament. (pi=22/7)

how can sensitivity of potentiometer be increased

current density and number of free electrons per unit volume

answer-

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

n=8.8*10^28

What is the dimensional formula of potential difference

An equiconvex lens of refractive index mu1, focal length f and radius of curvature R is immersed in a liquid of refractive indec mu2. Find the focal length of the lend in terms of original focal length and the refractive index of glass of lens and that of medium.

What is the definition of meter bridge?

hc = 1242eV nm. how ?

h ki value toh 6.636 smthng h fer yhan kya li h apne ?

What are the conditions for total internal reflection?

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

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??

why is potentiometer preferred over voltmeter?

Drift Speed of Electrons is of the order of 10

^{-3}ms^{-1}, but current is established in the circuit with the speed of Light. Explainwhat is the dimension of resistance....????

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.

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

ans is 6*10^-4, 3.75*10^15

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?

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

Three cells of emf 2V,1.8V and 1.5V are connected in series.Their internal resistances are 0.05ohm, 0.7ohm and 1ohm respectively.If the battery is connected to an external resistor of 4ohm via a very low resistance of ammeter, what would be the reading in the ammeter?

what are the advantages of potentiometer over votlmeter ?

Solve this :82. The equivalent resistance of the circuit between points O and A is â€‹

$\left(1\right)\frac{12\mathrm{R}}{13}\left(2\right)\frac{\mathrm{R}}{13}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{5\mathrm{R}}{13}\left(4\right)\frac{15\mathrm{R}}{13}$

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

4)Bulbs will not fuse

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?Compute the voltage drop across a 2 KW electric heater element whose resistance when hot is 20 ohm.

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

Calxulate the following:

1)the series resistance to be used in the circuit to have a current of 5 A

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.supply. A is made of usual resistance wire and B of an n-type semiconductor.

(a) In which bar is drift speed of free electrons greater?

(b) If the same constant current continues to flow for a long time, how will the voltage

drop across A and B be affected?

Justify each answer.

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?

In example no 3.6 at page 116 of NCERT Physics, the value of R is found to b 5/6 ohm.. bt i think that it's incorrect.. it shud b 5/4 ohm...

Even if v put the valur of R=5/6 ohm in the formula I=V/R then v dnt get the current I as 4 A.. But on putting R=5/4 ohm, v get the correct value of I too. So it shud b 5/4 and not 5/6....

Isnt it.....????????

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

Thank you

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.

No links plzz...

The network PQRS shown in the circuit diagram has the battery of 4V and 5V and negligible internal resistance. A milliammeter of $20\Omega $ resistance is connected between P and R. Calculate the reading in the ammeter.

is current is scalar or vector quantity?

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

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

1) 2:3

2) 2:1

3) 1:2

4) 1:1

$\left(A\right)2\phantom{\rule{0ex}{0ex}}\left(B\right)2.4\phantom{\rule{0ex}{0ex}}\left(C\right)10\phantom{\rule{0ex}{0ex}}\left(D\right)24$

My Question:

Draw V-I Graph for both ohmic and non-ohmic materials stating one example of each as well.thanks!

ans is 3000C

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?

two identical cells whether joined in series or in parallel gives the same current when connected to an external resistance of 1ohm. find the internal resistance of each cell.

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

10. In the following circuit diagram the value of resistance X for the potential difference between B and D is zero -

a) 4 ohm

b) 6 ohm

c) 8 ohm

d) 9 ohm

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.

Pls describe Callender-Griffith's Bridge and Carey-Phoster's Bridge

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

Why current density is a vector quantity when electric current is a scalar quantity?

1 NEWTON =how many dyne?

(1) 10 V

(2) 8 V

(3) 6 V

(4) Zero

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

A piece of copper of mass 50 g is drawn into a wire of length 50 m. Find the resistence of the wire . The density and specific resistence of copper are 8.9 * 10^3 kg m^-3 and 1.7 * 10^-8 ohm-m

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