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Syllabus

State the principal and working of a meter bridge?

29. Gravitational potential in a region is given by v=(3x+4y+12z) J/kg. The modulus of gravitational field at ( x=1, y=0,z=3) is

(1) 20 N/kg (2) 13 N/kg (3) 12 N/kg (4) 5 N/kg

On what factors the internal resistence of a cell depends ?

QF-2. A uniform rod is hinged as shown in the figure and is released from a horizontal position. The angular velocity of the rod it passes the vertical position is :

$\left(\mathrm{A}\right)\sqrt{\frac{12\mathrm{g}}{\mathrm{a}\mathcal{l}}}\left(\mathrm{B}\right)\sqrt{\frac{2\mathrm{g}}{3\mathcal{l}}}\left(\mathrm{C}\right)\sqrt{\frac{24\mathrm{g}}{7\mathcal{l}}}\left(\mathrm{D}\right)\sqrt{\frac{3\mathrm{g}}{7\mathcal{l}}}$

Draw an equipotential surface due to an electric dipole.

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

Solve this :33. If radius of earth reduces by 4% and density remains same, then find escape velocity change.

(1) Reduce by 2% (2) Increase by 2%

(3) Reduce by 4% (4) Increase by 4%

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

Define 1 Ampere.

an electric motor operating on a 50v d.c supply draws a current of 12 a if the efficiency of the motor is 30% estimate the resistance of the winding motor.

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?derivation for ampere circuital law?

a. 4L/9

b. 5L/9

c. 7L/18

d. 11L/18

How to solve an unbalanced Wheatstone bridge?

how can sensitivity of potentiometer be increased

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

What is the dimensional formula of potential difference

Q. . Two cells X and Y are connected to a resistance of 10 ohm as shown in the figure. The terminal voltage of cell Y is:-

(1) zero

(2) 2 V

(3) 4 V

(4) 10 V

What is the definition of meter bridge?

Q.47. The potential difference between X and Y in volts is :-

(1) 1

(2) -1

(3) 2

(4) -2

What are the conditions for total internal reflection?

Q. For the arrangement shown in the figure the tension in the string is:

(1) 6 N (2) 6.4 N (3) 0.4 N (4) Zero

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

why is potentiometer preferred over voltmeter?

The current through a wire depends upon time as ;

i = i

_{0}+ (x)sin Pi t , where i_{o}= (10) Ampere and x =( Pi/2) AmpereFind the charge crossed through a section of the wire in 3 seconds, and the average current for that interval.

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

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

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

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?

A car has a fresh storage battery of emf 12V and internal resistance 0.05 ohm.The starter motor draws a current of 90 A.After long use, the internal resistance of storage battery increases to 500 ohm.What maximun current can be drawn from the battery?Assume emf of the battery to remain unchanged.

what is vacus junction?

(a) What is the emf of each cell used?

(b) For what current from the cell, does maximum power dissipation occur in the circuit?

(c) Calculate the internal resistance of each cell.

what are the advantages of potentiometer over votlmeter ?

(1) ${N}_{1}$ > ${N}_{2}$

(2) ${N}_{1}$ > ${N}_{2}$

(3) ${N}_{1}$ = ${N}_{2}$

(4) ${N}_{1}and{N}_{2}$ would be in the vertical directions.

${N}_{1}$ ${N}_{2}$

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?????show that electric field is conservative?

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

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

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?

is current is scalar or vector quantity?

Explain the variation of conductivity nwith temp for (a) A metallic conductor (b) ionic conductor

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.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

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 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 uniform wire of resistance 36 ohm is bent in tne form of a circle .calculate the effective resistance across the points A and B.

1 ratio of there diameter

2 ratio of drift velocity of free electrons in them

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 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 potential diffrence of 200 Volt is applied to a coil at a temperature of 15

^{.}C and the current is 10 Ampere. What will be the temperature of the coil when the current ha fallen to 9 Ampere, the applied voltage being the same as before ? AndTemperature coffiecient of resistance (Alpha) = 1 / 234

^{.}C^{-1}

a) use kirchhoff's rules , calculate the current in the arm AC of the given circuit. (b) on what principle does the metre bridge work? why are the metal strips used in the bridge ?1)60 W bulb will fuse. 2)100 W bulb will fuse 3)both bulbs will fuse.

4)Bulbs will not fuse

(b) If intermediate cell has internal resistance are equal to 1 ohm that determine the potential difference between X and Y.

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

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

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?

derive the expression for drift velocity in an electric field.

a voltage of 30v is applied across a carbon resistor with the first , second and third rings of blue black and yellow colours. find the value of the current through the resistors.

plzzz help urgent

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.

Q. In the circuit shown all five resistors have the same value 200 ohms and each cell has an emf 3 volts. Find open circuit voltage and the short circuit current for terminals A and B.

what are kirchhoff's law?explain them.

24) A uniform rope of length L, resting on a frictionless horizontal surface is pulled at one end by a force F. What is the tension of the rope at a distance l from the end where the force is applied ?

(a) F (1 - l/L) (b) F(1 + l/L)

(c) F/(1 - l/L) (d) F/(1 + l/L)

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

1 NEWTON =how many dyne?

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

(I) the emf and

(ii) the internal resistance of the cell.

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

ABCD is a square where each side is uniform wire of resistance 1 Ohm. Find a point E on CD such that if a uniform wire of resistance 1 Ohm is connected across AE and a potential diffrence is applied across A and C, the points B and E will be equipotential.

Q1) working model for physics on the basis of electricity ........plz state two or three options...

guyz n xperts plzzzz reply soon.......... :) :D Hv a nice day