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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.
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?
why are alloys manganin constantan used to make standard resistance coil?
The ratio of drift velocity to that of the thermal velocity of an electron in an conductor is -------------------------
project onto study various factors on which the internal resistance/emf of a cell depends.
Define 1 Ampere.
derivation for ampere circuital law?
Using Kirchhoff’s Law determine the current I1, I2 and I3 for the network shown below:
How to solve an unbalanced Wheatstone bridge?
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?
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,
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
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?
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 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?
what are the advantages of potentiometer over votlmeter ?
THE CURRENT FLOWING THROUGH A CONDUCTOR IS 2mA at 50V & 3mA at 60V. IS IT A OHMIC OR NON-OHMIC CONDUCTOR?
show that electric field is conservative?
why is it safe to sit inside a car during a thunderstorm ?
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 Ig=50*1/10=5 mA .But the answer is given 125 mA.How?
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.
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-
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?
A resistance or R ohm draws a current from a potentiometer.The potentiometer has a total resistance R0 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?
A cell of emf 4V and internal resistance .5 ohms is connected across a load of resistance: i)7.5 ohms ii)11.5 ohms.calculate i) the ratio of the differenceas in the emf of the cell and the potential drop across the load, ii)the ratio of the currents in the two cases.this qustion is wrt potentiometer.sir i wolud like to get a response as soon as possible.
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
An electric heater & an electric bulb are rated 500W-220V and 100W-220V respectively.Both are connected in series to a 220V mains.Calculate the power consumed by
(b) Electric bulb
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.
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
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
Two 120V light bulb, one of 25W and other of 200W were connected in series across a 240V line.One bulb burnt out almost instantaneously.Which one was burnt and why?
Draw V-I Graph for both ohmic and non-ohmic materials stating one example of each as well.
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
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
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?
How is I=Qv and I=QA please explain. these formulae have been used in my guide.
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.
How come V=El
what are kirchhoff's law?explain them.
give two possible causes for one sided deflection in a potentiometer experiment.
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
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?
Name one substance whose resistance decreases with increase of temperature.
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???
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