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sorry mam/Sir. your answer is unfortunately wrong .my teacher had completed this question and his answer was different from your. it's correct answer according to my teacher is 1:1.

The speed of a DC shunt motor supplying a load can be reduced byarmature circuit

Fleming's left-hand rule is used for electric motors, while Fleming's right-hand rule is used for electric generators. ... In an electric motor, the electric current and magnetic field exist (which are the causes), and they lead to the force that creates the motion (which is the effect), and so the left hand rule is used.

thank u

Option two (2) is correct as electric generator, electric motor and electric bell do use the magnets in the function.

electrical fuse is based on the joule effect of the electrical current

transverse waves

Let ‘t’ be the time taken by both the stones to reach the water.

For the stone that is dropped, using,

S = ut + ½ at2

=> 441 = 0 + ½ (9.8)t2

=> t = 9.5 s

Let the other stone be thrown at initial speed ‘u’. It reaches the water in (9.5 – 1 =) 8.5 s.

Using,

S = ut + ½ at2

=> 441 = 8.5u + ½ (9.8)(8.52)

=> u = 10.2 m/s

So, the second stone is thrown at 10.2m/s

The resistance 2,3, and 6 are in parallel to each other so, 1/Req = 1/6+1/3+1/2 1/Req = (1+2+3)/6 = 6/6 = 1Ω

now this is in series with 4Ω , so they add up to give Req as 4+1 = 5Ω

now current will V/R = 2/5 = 0.4A

reading in the ammeter is = 0.4A

a)Electric generator works on the principle of electromagnetic induction. Electricity is generated by rotating a coil inside magnetic field.

b)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'.

. 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.

c)

ohm meter is used to measure resistance in a circuit.

ohmmeter is used to calculate the resistance in a circuit

ohm meter is correct answer

voltmeter is used to measure electric resistance in a circuits

option ( d ) is the right answer

Ohm meter is used to measure electric resistance in a circuit.

Ohm meter is used to measure electric resistance in a circuit

ohm meter is correct

option d is the correct answer of the given question

ohm meter is the correct answer.

d- ohm meter is used to measure electric resistance in a circuit

ohm meter is used to measuring the electric resistance in a circuit.

ohm meter is best answer

Let the k.e. in first case be xx = 1/2*m*v^2=200jin second caselet the kinetic energy be x'v'=vm'=2mx'= 1/2*2m*v^2x'= 2(1/2*m*v^2)x'=2(x)x'=2*200jx'=400j

a elastic wire is not depending to its original length ,so 1is correct

Option 1 is correct.Explanation:The maximum load supported by an elastic wire is independent of its length. Both the pieces will have same tension and the area of cross section remains same. Hence, the maximum stress which the pieces of wire will support remains the same.

F=GmM/R^2 F = 1/R^2 More the force less the distance. More the distance less theme forceThe radius must be decreased to root2

Gravitational force between two objects is inversely proportional to square of the distance between the two objects.

So,force becomes one fourth of original force.Hence, answer is 2/4=0.5N

Health is a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.

option (A) is correct.As starting and ending point is same, the displacement is zero, therefore, velocity is zero.

T = 2π √r^3/GM

27.3 = 2 * 3.14 √(3.84 * 10^5)^3/6.67 * 10^-11 * M or

2.73 * 2.73 = 2 * 3.14 * (3.84 * 10^5)^3/6.67 * 10^-11 * M or

M = 2 * (3.14)^2 * (3.84)^3 * 10^15/3.335 * 10^-11 (27.3)^2

= 6.02 * 10^24 kg

∴ mass of earth si found to be 6.02 * 10^24 kg.

Earth orbitstheSunatanaverage distanceof149.60million km(92.96millionmi), andonecompleteorbittakes 365.256 days (1sidereal year), during which timeEarthhas traveled940 million km(584millionmi).

Resistance = Voltage/current= 0.9/180ohmas pointer is showing theae values in voltmeter and in ammeter

option-Binverse to slipthanks

In this mode of operation, supply is given to the stator sides and the motor always rotates below the synchronous speed. The induction motortorquevaries from zero to full loadtorqueas theslipvaries. Theslipvaries from zero to one. ... From the curve it is seen that thetorqueis Invertly proportional to theslip.

option b inversely proportional to slip

B. inversely proportional to slip

For the pan to come in equilibrium... The anticlockwise moment of one force must be equal to clockwise moment of other force.

Anticlockwise moment= F*length= x*60 Clockwise moment=F*len= 100*40=4000

At equilibrium,

Anticlockwise moment=Clockwise moment60x = 4000x= 66.667 gf

In thesolidstate, ionic compounds such assodium chloridehave their ions fixed in position and therefore these ions cannot move sosolidionic compounds cannotconduct electricity. However in the molten state, ions in ionic compounds are free to flow and therefore moltensodium chloridecanconduct electricity..

No. It is not safe to repair electrical appliances outdoors during heavy downpour. This is because rain water contains dissolved salts. Therefore, rain water can conduct electricity. The electrician may get electrical shocks while working outdoors during rain.

Aslip ringis an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure. Aslip ringcan be used in any electromechanical system that requires rotation while transmitting power or signals.

The Slip Rings function is to make one or more continuous electrical connections from points in a stationary unit to points in a rotating section. The armature has two functions. The first is to carry current crossing the field, thus creating shaft torque in a rotating machine or force in a linear machine. The second role is to generate an electromotive force (EMF). In the armature, an electromotive force is created by the relative motion of the armature and the field.

The answer is car will not slip when moving with speed v

if you want to explain it then explain with reason and theoretical not optionally because I tick the right options

so Option a is correct

motion of earth around sun is an example of circular motion

circular motion is correct answer

circular motion is the correct answer of the given question

Motion of earth around sun is an example of circular motion

motion of earth around sun is an example of circular motion

uniform circular motion

Fallopian tubes are thefemalestructures that transport the ova from the ovary to the uterus each month In the presence of sperm n fertilization theuterine tubestransport the fertilized egg to the uterus for implantation & thetestesare contained in the scrotum and are composed of dense connective tissue containing around three hundred internal compartments called lobules

You require the satellite to have fuel only for putting into the orbit of the planet around which it needs to revolve. Once the satellite is sent into the atmosphere at a sufficient height above the planet (which can be calculated using classical mechanics considering the gravitational field theory of newton) it is imparted a horizontal velocity because of which it is set into a circular motion. See, this component of velocity is very much required for the satellite to undergo a circular motion as then only the gravitational force acting on the satellite acts as a centripetal force which is essential for everybody to undergo a circular motion, and once it starts revolving in a circular motion , it doesnot require any fuel as then the required fuel(centripetal force) is provided to the satellite by the gravitational force.

We can consider eccentricity to be a general term represented by e. Apogee is the point in the elliptical orbit where the planet is farthest from the sun and perigee is the point where the planet is nearest to sun.In order to calculate the ratio of kinetic energy, we can use conservation of angular momentum.

Now, we know that angular momentum is conserved for the planet throughout the orbit. Hence,Angular momentum at apogee = angular momentum at perigee

Let rabe the distance at apogee and rpbe the distance at perigee. The value of r1andr2can be represented in terms of the semi major axis and eccentricity (e) as mentioned below. If a is the length of semi major axis, thenra= a(1+e)and,rp= a(1-e)Now, by conservation of angular momentum, if the mass of the planet is m and the velocity at apogee and perigee be vaand vprespectively.m vara= m vprp, orva/vp=rp/ra= (1-e)/(1+e)

The ratio of kinetic energy is given by = (1/2mvp2)/(1/2mva2) = (vp/va)2=[(1+e)/(1-e)]2

Given the perihelion = r2 = shortest distance of a planet from Sun aphelion = r1 = longest distance of planet from Sun mass of planet = m. mass of Sun = M

So the length of the major axis of the Elliptical orbit of the planet = r1 + r2.

Semimajor axis = R = (r1 + r2)/2.

According to Kepler's laws:

The square of time period T of a planet revolving around Sun is proportional to the cube of semi major axis R of the elliptical orbit of the planet.

T² ∞ R³ T∞R³/² T ∞ [r1 + r2] ³/² Answer.

Actual value of the time period is given by:

option C

the angular momentum of the earth is conserved ( taking the sun as the origin) because gravitational force is a central force ,hence it has the functional form f(r)r^ .by definition of torque, torque on earth = rr^ * f(r)r^=0.Thus angular momentum of Earth is conserved .hope that helps.

Yes, the angular momentum is constant over the entire elliptical orbit. When the radius becomes small, the velocity compensates and vice versa so the total angular momentum is conserved. L=mvr

A bucket containing water is whirled in a vertical circle at arms length.then, radius of vertical circle = arms length it is given that radius of vertical circle , r = 0.75

so, minimum speed v at the top to ensure that no water spills out is given by v=√grwhere g is acceleration due to gravity.

so, v = √(9.8 × 0.75) = 2.711 m/s

we know, w=v/r

where is angular speed

so, = 2.711/(0.75) =3.615 rad/s

In an AC generator, a coil with N turns, all of the same area A and total resistance R, rotates withfrequency ω in a magnetic field B.

The maximum value of emf generated in the coil is NBAω

given : r=0.75m , g=9.8m/s2

To find : vH, wH(angular speed)

Formula : vH2=rg wH=vH/r

Calculation: vH2=o.75 * 9.8

=2.711m/s

wH=2.711/0.75

=3.615r ad/s

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For visible range,Violetcolour has maximum refractive index in glass so its speed will be minimum.