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Path function-depends upon the path at which system arrives at a given state. Example,Work and Heat.Point functions-which does not depend on path.Example, temperature, pressure, density, mass, volume, entropy, internal energy.They are the properties of the system.

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The main characteristics of metal powders include the particle sizedistribution, particle shape, the surface condition and thestructure of the powder. These impact bulk properties such asreactivity, flow ability, compressibility, porosity and hardenability that all improves as the particle size gets smaller.

The silver band represents tolerance value 10%

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1/f= 1/u+1/v is the correct answer of the given question

only convex mirror is capable of producing large field of view so that number of object is fit in an object.that's why it is used

s=ut+1/2at^2u=0 a=8 t=1ss=1/2*8*(1)^2s=4m

use the formula:S=1/2at^2

your, initial velocity(u)=0 acceleration(a)=8 time(t)=1secyou got final answer=4mS=4m(ans)

Total mechanical energy at hieght=k.e +p.e=mgh(as v=0)total mechanical enegy at hieght at the point=k.e+p.e=k.e+5/2k.e=7/2k.eby law of conservation of energymgh=7/2k.e2*mgh=2*7/2k.emgh=7*1/2mv^2gh=7/2v^22gh/7=v^2square root (velocity at height/7)=vH/3, 2√gH/3 is the ans to ur question

Since Galvanometer is a very sensitive instrument, therefore it can not measure high potential difference. In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer.

Let resistance of galvanometer = Rgand resistance Rx(high) is connected in series to it. Then combined resistance = (Rg+ Rx).

If potential between the points to be measured = V and if galvanometer gives full-scale deflection, when current "Ig" passes through it. Then,

V = Ig(Rg+ Rx)V = IgRg+ IgRxV – IgRg= IgRxRx= (V – IgRg)/Ig

Thus Rxcan be found.

1)We all know that we got ac supply in our homes and we got this supply by transmitting ac over long distances. AC can be transmitted using step up transformers but direct current or dc can not be transmitted by this method.

2)The ac is easy to generate than dc.

3)It is cheaper to generate ac than dc.

4)The ac generators have higher efficiency than dc.

5)The loss of energy during transmission is negligible for ac.

6)The ac can be easily converted into dc.

7)The variation of ac can easily be done using transformers either step up or step down.

8)The value or magnitude of ac can be decreased easily without loss of excess of energy. This can be done by using choke coil.

Conversion ratio is more than 1 of a breeder reactor

LAMDA= h/√(2mE)= (6.626×10^-34)/√(2×9.1×10^-31×11.375×1.6×10^-19)=3.6406×10^-10 m=3.6406 A°

2.3 ev is correct answer

AVan de Graaff generatoris anelectrostatic generatorwhich uses a moving belt to accumulateelectric chargeon a hollow metal globe on the top of an insulated column, creating very highelectric potentials. It produces veryhigh voltagedirect current(DC) electricity at low current levels. It was invented by American physicistRobert J. Van de Graaffin 1929.Thepotential differenceachieved by modern Van de Graaff generators can be as much as 5 megavolts. A tabletop version can produce on the order of 100,000 volts and can store enough energy to produce a visible spark. Small Van de Graaff machines are produced for entertainment, and for physics education to teachelectrostatics; larger ones are displayed in somescience museums.

DC Generator

A dc generator is anelectrical machinewhich converts mechanical energy intodirect current electricity. This energy conversion is based on the principle of production of dynamically induced emf. This article outlinesbasic construction and working of a DC generator.

Construction Of A DC Machine:

Note:A DC generator can be used as a DC motor without any constructional changes and vice versa is also possible. Thus, a DC generator or aDC motorcan be broadly termed as aDC machine. These basic constructional details are also valid for theconstruction of a DC motor. Hence, let's call this point asconstruction of a DC machineinstead of just 'construction of a dc generator'.

A DC machine consists of two basic parts; stator and rotor. Basic constructional parts of a DC machine are described below.

Yoke:The outer frame of a dc machine is called as yoke. It is made up of cast iron or steel. It not only provides mechanical strength to the whole assembly but also carries the magnetic flux produced by the field winding.

Poles and pole shoes:Poles are joined to the yoke with the help of bolts or welding. They carry field winding and pole shoes are fastened to them. Pole shoes serve two purposes; (i) they support field coils and (ii) spread out the flux in air gap uniformly.

Field winding:They are usually made of copper. Field coils are former wound and placed on each pole and are connected in series. They are wound in such a way that, when energized, they form alternate North and South poles.

Armature core:Armature core is the rotor of a dc machine. It is cylindrical in shape with slots to carry armature winding. The armature is built up of thin laminated circular steel disks for reducing eddy current losses. It may be provided with air ducts for the axial air flow for cooling purposes. Armature is keyed to the shaft.

Armature winding:It is usually a former wound copper coil which rests in armature slots. The armature conductors are insulated from each other and also from the armature core. Armature winding can be wound by one of the two methods; lap winding or wave winding. Double layer lap or wave windings are generally used. A double layer winding means that each armature slot will carry two different coils.

Commutator and brushes:Physical connection to the armature winding is made through a commutator-brush arrangement. The function of a commutator, in a dc generator, is to collect the current generated in armature conductors. Whereas, in case of a dc motor, commutator helps in providing current to the armature conductors. A commutator consists of a set of copper segments which are insulated from each other. The number of segments is equal to the number of armature coils. Each segment is connected to an armature coil and the commutator is keyed to the shaft. Brushes are usually made from carbon or graphite. They rest on commutator segments and slide on the segments when the commutator rotates keeping the physical contact to collect or supply the current.

Working Principle Of A DC Generator:

According toFaraday’s laws of electromagnetic induction, whenever a conductor is placed in a varying magnetic field (OR a conductor is moved in a magnetic field), an emf (electromotive force) gets induced in the conductor. The magnitude of induced emf can be calculated from theemf equation of dc generator. If the conductor is provided with a closed path, the induced current will circulate within the path. In a DC generator, field coils produce an electromagnetic field and the armature conductors are rotated into the field. Thus, an electromagnetically induced emf is generated in the armature conductors. The direction of induced current is given byFleming’s right hand rule.

Speed=10m/s

multiply the speed value by 3.6Speed=10×3.6=36Km/hr

Theworking of Van de Graaff generatoris based on theprincipleof electrostatic induction and action of points. A hollow metallic sphere A is mounted on insulating pillars as shown in the animation. A pulley B is mounted at the centre of the sphere and another pulley C is mounted near the bottom.

construction

Yes, The charged particle would experience a force in the direction(if +ve)or opposite to the direction(if-ve) of electric field, according to equation ,F= qE(where F and E are vectors).

X = At²+B

so, B should have dimension of L and A should have dimension of L/T² so (√AB) has dimension of L/T , that is Velocity

option B.

A Van de Graaff generator is an electrostatic generator which uses a moving belt to accumulate electric charge on a hollow metal globe on the top of an insulated column, creating very high electric potentials. It produces very high voltage direct current electricity at low current levels.

from which chapter tell me

Given, x = at^2 - bt^3

Then, Velocity = dx/dt= 2at - 3bt^2

Acceleration = d^2x/dt^2 = 2a - 6bt

Now, Acceleration = 02a - 6bt = 0t = 2a/6b = a/3b

(3) is correct option

option 3 is correct answer

option 3 is correct using calculas method

Natural philosophy was earlier name of Physics.

According to Archimedes principle, a body when immersed in a fluid shows an apparent loss of weight which is equal to the weight of the fluid displaced by the body. So a heavy stone when under water, is acted upon by upthrust due to water , which ultimately reduces the true weight of the stone.

1)According to Archimedes principle, a body when immersed in a fluid shows an apparent loss of weight which is equal to the weight of the fluid displaced by the body. So aheavy stonewhen underwater, is acted upon by upthrust due towater, which ultimately reduces the true weight of thestone.

1. According to Archimedes principle, a body when immersed in a fluid shows an apparent loss of weight which is equal to the weight of the fluid displaced by the body. So a heavy stone when under water, is acted upon by upthrust due to water , which ultimately reduces the true weight of the stone.

2.smaller the area - larger the pressure on the surfaceto make sure the foundation of the tall buildings and dams are strong, they are built with a broader basement .so, if the area in the bottom is higher then the pressure exerted by the buildings and dams on the ground would automatically be less .

2) Buildingsare massive structures which exerts tremendous pressure on the ground and likely to sink. To avoid sinking theirfoundationsare madewide, so that pressure on the ground decreases.