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Integrate I dt from t=2 to t=6swe get Q= 4×4+36-4=48Coption B

0ption B is the right answer

option B is the correct answer

(I) A conductor having some appreciable resistance is called as its resistivity.

a) Anelectric generatorworks on theprincipleof Faraday's law of electromagnetic induction. Faraday's law of electromagnetic induction states that “whenever a current carrying conductor are placed in the magnetic field, then a flux is induces in the circuit due to which a current start to flow in the rotor also.b)1.Increasing the speed of rotation of the coil2.Increasing the number of coils

c)

Scatteringoccurs whenlightor other energy waves pass through an imperfect medium (such as air filled with particles of some sort) andaredeflected from a straight path. ... The colors oflightseparate as the sun's rays pass through the atmosphere, and blueisthe color that reaches us.

In overhead system number of cross arms carried by a pole depends on the number of path / wire it has to carry

λ = h/√(2m(K.E))

where

K.E= Kinetic Energy

m= Mass of object

p= Momentum of object

h = Planck’s constant

Normally if you have an electron beam and its moving with some velocity v then it will have a positive energy

K. E. = P^2/ 2.m…

if you say that you are taking the total energy of an electron as negative-

it means that your electron is in a force field and bound to a system say an atom.

In bound states the particle have total energy

E = T + V = the kinetic energy + the potential energy ;

the first term will always be positive but the potential can be negative or positive.

In bound state as one needs extra energy to get the electron free from binding by the force—- the potential must be negative.

If theV>>Tin that case the total energy is negative.

e.g. in H-atom the ground state electron has total energy-13.6 eVand other excited states are moving towardszero energy value…

therefore electron will always found in total energy state negative..otherwise if its free it can have only positive energy.

option D it first decreases and then increases.

potential energy is correct answer

a) I=V÷R =>220÷24=9.2b) 220÷48=>4.6c) 220÷12=>18.3

The answer is option 4.

nuclearsizesis the femtometre (fm), which equals 10−15metre. Thediameter of a nucleusdepends on the number of particles it contains and ranges from about 4 fm for a lightnucleussuch as carbon to 15 fm for a heavynucleussuch as lead

SI unit of sound is decibel.which is represented as dB.

option (b) is correct.

First connect 3–3 cells in parallel to get 1500 mA and then connect these traids in series to get a voltage of 3 volts

I think d...........

I think (c)........

answer (c) is the right answer

(a)....is correct.. ..

the answer is a,c,d because when friction is ready is it is zero it access static addiction and the frictional force is that directly proportional to the area of contact between the two surfaces because you can take it as example of rolling fiction and kinetic friction is always greater than the rolling friction because it can have some energy more than rolling friction

Electric charge: cgs unit-franklin SI unit-coulombRelation: 1 coulomb is equal to 2997919999.934 franklin.

option c is the correct answer of the given question

Distance travelled by body = |x(t=3) -x(t=0)|=|3²-4(3)+6-0²+4(0)-6|=|9-12|= 3 m

When a force acts upon an object to cause a displacement of the object, it is said that work was done upon the objectIts SI unit is Joule.

W = F × S

Where,F stands for force and S is the displacement

The dimensions assigned to the gravitational constant are force times length squared divided by mass squared; this is equivalent to length cubed, divided by mass and by time squared: InSIbaseunits, this amounts to meters cubed per kilogram per second squared: In cgs,Gcan be written asG≈6.674×10−8cm3⋅g−1⋅s−2.

ampere is the SI unit of current

In the International System of Units (SI), electric potential is expressed in units ofjoulespercoulomb(i.e.,volts), and differences in potential energy are measured with avoltmeter.

Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material.

The ratio of the density of a substance to the density of a standard usually water for a liquid or solid,and air for a gas

Mass of the train is,

m = 105kg

Uniform speed of the train is, u = 72 km/h = 20 m/s

Frictional force per metric ton is = 0.5 × 9.8 N = 4.9 N

Therefore, frictional force on the train = 4.9 × 100 = 490 N

Since, the train has to overcome this frictional force to maintain a constant speed, the power is given by,

Power = (force)(speed) = 490 × 20 = 9800 W

thanku

Abase unit(also referred to as afundamental unit) is a unit adopted for measurement of a base quantity. A base quantity is one of a conventionally chosen subset of physical quantities, where no quantity in the subset can be expressed in terms of the others.

Fundamental quantitiesand theirUnitsare;

Length- Meter(SI), Cm(CGS)

Mass - Kilogram

Time- Seconds

Electric current -Ampere(SI), Bi(CGS)

Temperature- Kelvin,

Amount of substance -Mole

and

Luminous intensity.- Candela.

Light year is a unit of measuring larger distances.So it's not related to time.

(a) Order of magnitude is defined as the power of 10 used to express the magnitude of a physical quantity under consideration, e.g.,(i)Order of magnitude of time intervals of 1.2 x ${{10}^{-6}}sis-6.(ii)Order or magnitude of distance of 4.5 x {{10}^{6}}is + 6.(b) 1 light year = 9.46 x {{10}^{15}}m = {{10}^{16}}mOrder of magnitude of light year is 16

itz not the answer

1) length is the fundamentals quantity

2) light year is not the unit of time