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Principle:

Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque.

Working:

Suppose the coilPQRSis suspended freely in the magnetic field.

Let

l= LengthPQorRSof the coil

b= BreadthQRorSPof the coil

n= Number of turns in the coil

Area of each turn of the coil,A=l×b

LetB= Strength of the magnetic field in which coil is suspended

I= Current passing through the coil in the directionPQRS

Let, at any instant, α be the angle which the normal drawn on the plane of the coil makes with the direction of magnetic field.

The rectangular coil carrying current when placed in the magnetic field experiences a torque whose magnitude is given by,

τ=nIBAsinα

Due to deflecting torque, the coil rotates and suspension wire gets twisted. A restoring torque is set up in the suspension wire.

Letθbe the twist produced in the phosphor bronze strip due to rotation of the coil andKbe the restoring torque per unit twist of the phosphor bronze strip. Then,

Total restoring torque produced =kθ

In equilibrium position of the coil,

Deflecting torque = Restoring torque

∴NIBA = kθ

Or,

electronics, ananalog-to-digital converter(ADC,A/D, orA-to-D) is a system that converts ananalog signal, such as a sound picked up by amicrophoneor light entering adigital camera, into adigital signal. An ADC may also provide an isolated measurement such as anelectronic devicethat converts an input analogvoltageorcurrentto a digital number representing the magnitude of the voltage or current. Typically the digital output is atwo's complementbinary number that is proportional to the input, but there are other possibilities.

A type ofwavemotion in which the particles displacement ofwaveis parallel to the direction ofwave propagation is called alongitudinal wave.

Itcanbeproducedin solid, liquid as well as gases

it means that size of image is equal to size of object and the distance of object from the mirror is same as the distance of image from the mirror

U=-2f

V=?

1/u+1/v=1/f

1/-2f + 1/v = 1 /f

1/v= 1/f + 1/2f

V = 2f/3

Now, m=-v/u

=-2f/3*-2f

=1/3

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are as cold as possible. The best place to find such a combination is in the tropics (between the latitudes of about 20°N and 20°S).

The diesel engine are available in the size of mega watts

1. No two magnetic lines of force intersect each other.

2. The field lines emerge from North Pole and merge at the South Pole.

3. The direction of field lines is from its south pole to its north pole.

4. Magnetic field lines are the closed curves.

1.they orginate from north pole and end at south pole of a magnet.2. they don't intersect each other

The properties of magnetic field lines can be summarized by these rules: The direction of the magnetic field is tangent to the field line at any point in space. A small compass will point in the direction of the field line. The STRENGTH bof the field is propotional to the closeness of the lines.

Solarradiation is created by nuclear fusion reactions in thesun'score, which causes it to emit a large amount of electromagnetic radiation, mostly in theformof visible light. This radiation is theenergythat heats the Earth.

A nuclear reactor, formerly known as an atomic pile is a device used to initiate and control a self sustained nuclear chain reaction. Nuclear reactors are used at nuclear power plants for electricity generation and in propulsion of ships. These either drive a ship's propellers or turn electrical generator's shafts.

A moderator is a material used in a nuclear reactor to slow down the neutrons produced from fission. By slowing the neutrons down the probability of a neutron interacting with Uranium-235 nuclei is greatly increased thereby maintaining the chain reaction. For this the reactor uses control rods.

Control rods are used in nuclear reactors to control the fission rate of uranium and plutonium. They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fissioning.

option d) Surface tension is the to force per unit length. Thatmeansformula for surface tension is = force/length . As we know that the dimensional formula for length is L . And that for force is MLT^-2. So the dimensional formula for surface tension can be obtained by dividing the dimensional formula of force and length.

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The twinkling of stars is due to atmospheric refraction. When light from a distant source (a star) passes through our turbulent (moving air) atmosphere, it undergoes refraction many times. When we finally perceive this light from a star, it appears to be twinkling! This is because some of the light rays reach us directly and some bends away from and toward us.

Planets do not twinkle because they are non-luminescent bodies. Only luminescent celestial bodies ( stars)emit light continuously and this light then passes through the atmosphere of varying densities they seem to twinkle due to atmospheric multiple refractions. That is why stars twinkle but planets do not.

d.) correct answer of following

c is the correct answer

d is correct answer not c

d is the correct answer of question

In book it is given like this...

This also means same but some more simple language you have

Drug companies manufacture medicines, such as cough syrup, that have a high viscosity yet are still drinkable, in order to coat the throat.

change in velocity is called acceleration

pressure =force /area

GivenV=12VQ=2CUse W=VQ =12V×2C =24J

Given that

f= 20cm =0.2m

Power of convergence is given by

p =1/f

So, p= 1/0.2 = 5D

Since p1=p2.

So both lenses have same convergence of refracted light.

Given that the power of lens P = 2D

We know that, P = 100 / f(cm)2 = 100/f

2f = 100

f = 100/2 = 50 cm

The focal length of the lens = 50 cm

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Pairs of forces connected by Newtons third law of motion are F-F, R1-R1, R2-R2, R3-R3 and R-R. Though other forces are also connected byNewtons third law of motionbut they do not show as pairs in the figure. Weight W1 and W2 are distributed on the wheels according to loading patterns and C.G. of the wagon and the floor reactions P1 and P2 are according to the net force downwards on the wheels.

Ap orbitalhas the approximateshapeof a pair of lobes on opposite sides of the nucleus, or a somewhatdumbbell shape.

soind/noise ki unit decible hai

Escape speed is the minimum speed with which a mass should be projected from the Earth's surface in order to escape Earth's gravitation field.

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Themoremassive the molecule of a gasis, the lower the average velocity of molecules of that gas at a given temperature, and the less likely itisthat any of them reachescapevelocity. Thisiswhyhydrogen escapesfrom anatmosphere more easily thancarbon dioxide.

Cleansing action of Soaps and detergents. Most of the dirt is oily in nature and oil does not dissolve in water. The molecule ofsoapconstitutes sodium or potassium salts of long chain carboxylic acids. In the case ofsoaps, the carbon chain dissolves in oil and the ionic end dissolves in water.

When connected in series R₁ + R₂ = 80 Ω ………[1]

When connected in parellelR₁R₂ / (R₁ + R₂) = 20 Ω ………[2]

Equation [2] can also be written asR₁R₂ / 80 = 20 ………[∵ From (1)]R₁R₂ = 1600 R₁ = 1600 / R₂

Substitute this value in equation [1](1600 / R₂) + R₂ = 80R₂² - 80R₂ + 1600 = 0

Solve above polynomial equationWe will get R₂ = 40 ΩIf R₂ is 40 Ω then from equation [1] R₁ is also 40 Ω

Therefore,Values of two resistance is 40 Ω

In series, R1 + R2 = 80in parallel, 1/R1 + 1/R2=1/20R1+R2/R1R2 = 1/2080/R1.R2 = 1/20R1.R2 = 1600put R2=80-R1R1(80-R1)=160080R1-R1^2 = 1600R1^2 - 80R1 + 1600=0R1^2 - 40R1- 40R1 + 1600=0R1(R1-40)-40(R1-40)=0(R1-40)(R1-40)=0R1=40 R2=80

R2=80-R1=80-40=40 ohm