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Syllabus

State the principal and working of a meter bridge?

(1) 9

(2) 3

(3) $\frac{1}{9}$

(4) 1

On what factors the internal resistence of a cell depends ?

(1) 1.7 R

(2) 3.25 R

(3) 2.5 R

(4) 4.2 R

Draw an equipotential surface due to an electric dipole.

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

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

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

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

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

Define 1 Ampere.

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

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

derivation for ampere circuital law?

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

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?

6.If potential of A is 10V, then potential of B is -(A) 25/3 V (B) 50/3 V (C) 100/3 V (D) 50 V

What are the conditions for total internal reflection?

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

(1) 1

(2) -1

(3) 2

(4) -2

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

why is potentiometer preferred over voltmeter?

1. a battery has emf 4V and internal resistance r. When tis battery is connected to an external resistance of 2 ohm a current of 1amp, flows in the circuit. How much current will flow if the terminals of the battery are connected directly.

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

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

4)Bulbs will not fuse

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

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%

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 is vacus junction?

13.A wheel is rotating about an axis through its centre at 720 rpm. It is acted on by a constant torque opposing its motion for 8 seconds to bring it to rest finally. The value of torque (in N-m) is :-$\left(GivenI=\frac{24}{\mathrm{\pi}}kg-{m}^{2}\right)$(l) 48 (2) 72 (3) 96 (4) 120

what are the advantages of potentiometer over votlmeter ?

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) 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.

show that electric field is conservative?

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

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?

Q.53. In the circuit shown in figure, find the current through the branch BD.

(1) 1 A

(2) 5 A

(3) 3 A

(4) 7 A

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. 4L/9

b. 5L/9

c. 7L/18

d. 11L/18

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

is current is scalar or vector quantity?

4 identical cells each of emf 8v and internal resistance 2.5 ohm are connected in series and charged by 100 v dc supply using 24 ohm resistor in series.

calculate: potential difference across the cells during recharging and the chemical energy stored in the cell in ten minutes

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

Q.43. In the circuit shown figure, the power which is dissipated as heat in the 6 $\Omega $ resistor is 6 W. What is the value of resistance R in the circuit?

1. 6 $\Omega $

2. 10 $\Omega $

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.

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?My Question:

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

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 :

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

1 ratio of there diameter

2 ratio of drift velocity of free electrons in them

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.

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

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?

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.

what are kirchhoff's law?explain them.

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

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

1 NEWTON =how many dyne?

Two conductors have the same resistance at 0 degree but their temperature cofficients of resistances are Alpha1 , Alpha2 . The respective temperature cofficients of their series and parallel combinations are nearly

(1) Alpha1+Alpha2 / 2 , Alpha1+Alpha2

(2) Alpha1+Alpha2 , Alpha1+Alpha2 / 2

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

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

28. The ammeter reading in the circuit below is :

(1) 2 A

(2) 3 A

(3) 6 A

(4) 5 A

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