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Syllabus

State the principal and working of a meter bridge?

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?

On what factors the internal resistence of a cell depends ?

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

Draw an equipotential surface due to an electric dipole.

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

(1) 10 V

(2) 8 V

(3) 6 V

(4) Zero

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

Define 1 Ampere.

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

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

derivation for ampere circuital law?

How to solve an unbalanced Wheatstone bridge?

how can sensitivity of potentiometer be increased

80. There are 32 cells each having emf 1 V and internal resistance 1 $\Omega $. All the cells are connected together in a closed loop. When terminal voltage of cells are measured, they are found to be either 0.5V or 1.5 V. How many cells are having their polarities reserved with respect to the majority of cells?

(1) 6 (2) 12

(3) 8 (4) 10

What is the dimensional formula of potential difference

## Father (80 kg) and son (30 kg) are sitting at one of the ends of a 4 m long boat (40 kg) standing still on water. They start to shift slowly. Father stopped at centre of boat but son stopped at other end. Neglecting friction with water, how far does the boat move on the water during the process?

(1) 1.87 m (2) 1.5 m (3) 1.25 m (4) 1.2 m

What is the definition of meter bridge?

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

What are the conditions for total internal reflection?

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

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

Why are you advised not to drag the jockey hard on the metre bridge wire while determining the null point?

why is potentiometer preferred over voltmeter?

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

(1) $1$

(2) $\frac{1}{2}$

(3) $\frac{2}{3}$

(4) 3

14) In the following circuit, the resistance of a voltmeter is 10,000$\Omega $ and that of an ammeter is 20 $\Omega $. If the reading of an ammeter is 0.1 ampere and that of voltmeter is 12 volt then the value of R is :

(1) $122\Omega $

(2) $100\Omega $

(3) $118\Omega $

(4) $116\Omega $

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

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?

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 whose resistance is 80 ohm is cut into 3 pieces of equal lengths which r then arranged in parallel.calculate d resistance of d combination,.

what are the advantages of potentiometer over votlmeter ?

show that electric field is conservative?

(1) 9

(2) 3

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

(4) 1

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

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

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?(1).Diode

(2).Thyristor

(3).PN junction system

(4).All of these

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-

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.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 Ω. What would be the length of AB for which galvanometer shows zero deflection.

(3) 165 cm (4) 50 cm

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. Straight line

B. Hyperbola

C. Parabola

D. circle

Explain pls?

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

Find the value of the unknown resistance X in the circuit of fig. if no current flows through the section AO. Also calculate the current drawn by the circuit from the battery of emf 6 V and negligible internal resistance

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

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

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.

10^9 electrons pass from A to B in 10^-3 second.Calculate the strength of current and give its direction.

ans is 1.6*10^-7A.

is current is scalar or vector quantity?

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

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 carbon resistor of 74k ohm is to be marked with rings of different colours for its identification write the sequence of colours ?

My Question:

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

An electric power station (100MW) transmits power to distant load through long and thin cable .

which of the two modes of transmission would result in lesser power wastage : power transmission of: (i)20000V or (ii)200V ?

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

(1) 1$\Omega $

(2) 2$\Omega $

(3) 3$\Omega $

(4) 5/8$\Omega $

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?

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(a) Heater(b) Electric bulb12 identical resistance R each form a cube . Resistance across its face diagonal corners is?

EXPERT/ FRIENDS PLZ. . SOLVE IT = write the corresponding values of x and y for which the lengths of conducters x= 4ohm , y= 48*10

^{-8}ohm-m are reduced to half ?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.

17. The side of a cube is measured as (10.5 $\pm $ 0.1) cm. Find the volume of the cube: -

(1) (11.58 $\pm $ 0.33) $\times $ 10

^{2}cm^{3}(2) (11.58 $\pm $ 0.66) $\times $10

^{2}cm^{3}(3) (11.58 $\pm $ 0.11) $\times $10

^{2}cm^{3}(4) (11.58 $\pm $ 0.2) $\times $10

^{2}cm^{3}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

1 NEWTON =how many dyne?

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

Explain how one ‘observes an inconsistency’ when Ampere’s circuital law is applied to the process of charging a capacitor.

How this ‘contradiction’ gets removed by introducing the concept of an ‘additional current’, known as the ‘displacement current’?

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

1)Each bulb is 200V

2)100W bulb is greater than that across 60W bulb

3)100W bulb is smaller than that across 60W bulb

4)Each bulb is 100V