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When the torque actingupon asystem is zero, the angular momentum isconstant.

See, suppose we have l* as the initial length and l being the final lengthHence, l=l* x (1+αΔt);where Δt= t2-t1 and α=coefficient of linear expansionor, l=l* + l* x αΔtor, (l-l*)/l*=αΔt=1/100So, A=A* x (1+βΔt); //b=coefficient of area expansionor (A-A*)/A*=βΔt=2αΔt=2/100=2% (β=2α)

When there is change of state then specific heat is not taken into consideration.The latent heat of that solution is taken care of when there is change of state. Latent Heat of that solution varies with different liquid and also differs with from which state to which state it is converted.

Obviously Nichrome because resistivity of Nichrome is greater than that of Copper.

As mention above, both wires are of same length and having same cross section area.Therefore resistance of Nichrome wire will be more than that of Copper.

Since more resistance means more I^2R loss (which is dissipated as heat).

Therefore Nichrome wire will heat sooner as compared to Copper(It is a good conductor of current and have very little resistance).

Resistance can be obtained by:

R=(rho)*l/a

thanks

As resisivityof Nichrome wire is greater than the resistivity of copper wire. So, it would have high resistance than that of copper wire and hence heat produced in Nichrome wire is more than that of copper wire as heat produced in a conductor when a current I is passed through it depends upon the value of resistance of the conductor. Since resistance of Nichrome wire is greater, so it would get heated first.In addition, nichrome is an alloy and as we know that alloys have much higher resistivity than that of metals.

90 degrees is the correct one

In themetallurgy of aluminium, the metal is to be isolated from alumina (Al2O3) by carrying out its electrolytic reduction. ... It is therefore, mixed withcryolite(Na3AIF6) which lowers its melting point to 1173 K. Moreover,cryolitealso increase the electrical conductivity of alumina.

magnitude of unit vector = 1

so‌ √(0.2)²+(0.5)²+x² = 1=> 0.04 +0.25+x² = 1=> x² = 1-0.25-0.04 = 1-0.29 = 0.71 so, x = √0.71..

option 4.

tq..

Ans :- ThelawCoulomb's law statesthat: The magnitude of theelectrostatic forceof attraction or repulsion between two point charges is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance between them.

Static friction :

Static friction is a force that keeps an object at rest. It must be overcome to start moving the object. Once an object is in motion, it experiences kinetic friction. If a small amount of force is applied to an object, the static friction has an equal magnitude in the opposite direction

Static inertiarefers to theinertiaof a body at rest. Theinertiaof a book on the table isstatic inertia.

Lightbulbs have a very simple structure. At the base, they have two metal contacts, which connect to the ends of anelectricalcircuit. The metal contacts are attached to two stiff wires, which are attached to a thin metalfilament. The filament sits in the middle of the bulb, held up by aglass mount. The wires and the filament are housed in a glass bulb, which is filled with aninert gas, such asargon.

When the bulb is hooked up to a power supply, anelectric currentflows from one contact to the other, through the wires and the filament. Electric current in a solid conductor is the mass movement offree electrons(electrons that are not tightly bound to anatom) from a negatively charged area to a positively charged area

Structure: An electric bulb consists of a transparent glass covering that encloses a thin, coiled metal wire known as filament. The filament is made of tungsten supported by two thick wires. The lower ends of a thick wires are connected to the metal base of the bulb. The glass chamber is filled with an inert gas (argon).Working: When current is passed through an electric bulb, the filament becomes hot and it glows.An electric bulb converts electrical energy into heat energy and light energy.

magnitude of vectors OA and OB is10n+10n=20N

20 N is the right answer

20N is the right answer

20N is the right answer

mahiti de of sector OA and OB is 10n+10n=20N

20 N is the correct Ans👍👍👍

magnitude of vectors oA and OB is 10n+10n=20N

20N is the right answer

20n is the correct answer

when a parallel to b

now in the next step take root on both sides hence proved.

1

2

3

Velocity at C me aapne t1+t2 kyun kiya hai???

thank you so much

the average speed of the particle during motion option 1 8.0m/s

8.0is the correct answerplease like my answer

option 1 is the correct answer

1 is the correct option answer

c-8 , Given x ∞ t² => dx/dt = v ∞ 2t => d²x/dt = dv/dt = a ∞ 2 is constant

so, option 4.

😃

c7 bhi

sol. of c7

Coefficient of area expansion = 2* coefficient of linear expansion= 2*1.1*10-⁴= 2.2*10-⁴ °C-¹

Please hit the like button if this helped you.

The first magnets were not invented, but rather were found from a naturally occurring mineral called magnetite. Traditionally, the ancientGreeks were the discoverers of magnetite. There is a story about ashepherdnamedMagneswhose shoe nails stuck to a rock containing magnetite.So, Magnes is believed to have discovered magnet.

Van der Waals equation of state

thanx

Need for modulation:

The baseband signals can be transmitted directly, but the baseband transmission has many limitations which can be overcome using modulation.

In the process of modulation, the baseband signal is translated i.e. shifted from low frequency to high frequency.

This frequency shift is proportional to the frequency of carrier.

Inthermodynamics, areversible processis aprocesswhose direction can be "reversed" by inducing infinitesimal changes to some property of the system via its surroundings. Throughout the entirereversible process, the system is inthermodynamicequilibrium with its surroundings.

6 is the correct answer

6 is the correct answer of the given question

Option B

in virtual ground property the potential of inverting and noninverting and are same

Battery has free charges of opposite polarities on the two ends. Hence a potential difference is created. It doesn't produce any free electrons. Because of the potential difference created, free electrons within the wire are able to move and we get a current.

An optical instrument either processes light waves to enhance an image for viewing, or analyzes light waves to determine one of a number of characteristic properties

Reactivate power = that power that is watt less and have no use in power supplyso reactivate power will be less in this caseit will be (w1-w2)√3

54×99=5,346. .

54 × 99 = 5346 very simple question

Thegalvanometerconsists of a coil of wire often rectangular, carrying the current to be measured.There are generally many turns in the coil to increase its sensitivity.The coil is placed in a magnetic field such that the lines of B remain nearly parallel to the plane of wire as it turns.This is achieved by having a soft iron cylinder placed at the center of the coil.Magnetic field lines tend to pass through the iron cylinder, producing the field configuration.The moving coil is hung from a spring which winds up as the coil rotates; this winding up produces a restoring torque proportional to the winding up (or twisting) of the spring, i.e. to the angular deflection of the coil.The coil comes to equilibrium when this restoring torque k balances the torque due to the magnetic field balances the torque due to the magnetic field.Since by design field lines are radial,

we have sinq-1 ,so that for equilibriumkø = INBA

Thus the deflectionøof the galvanometer is proportional to the electric currentIpassing through it.