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d..here is ur ans...Potentiometer is a device used to compare the e.m.f. ... The potentiometer works on the PRINCIPLE that when a CONSTANT current FLOWS through a wire of uniform cross SECTIONAL area, potential difference between its two points is directly proportional to the length of the wire between the two points.mark as brainlist..

aluep=1000wattV=220vthen p=v*II=p/vI=1000/220=4.54Athen the FUSE should be of 5A.

of curvature of SPHERICAL mirror is the RADIUS of a HOLLOW SPHERE of which the mirror is a part. we know, f=r/2 =12.25/2 =6.125 hope it's HELPFUL to you..

ng to Ohm's LAWV(potential difference) is DIRECTLY proportional to I ( current flowing through the conductor) and TAKING the CONSTANT of proportionality as RV = I × R

refracted to SCATTER the white light into SEVEN coulours "VIBGYOR"

f lens ids DEFINED as the RECIPROCAL of focal length in metre. SI UNIT is diophtreD

s DEFINED as the rate of WORK doing in PER UNIT TIME

riend,◆ ANSWER -R1/R2 = 1/6◆ EXPLAINATION-# Given-ρ1 = 1.62×10^-8 ohm-mρ2 = 4.86×10^-8 ohm-ml1/l2 = 2d1/d2 = 1/2# Solution-Resistance of wire A,R1 = ρ1l1 / A1Resistance of wire B,R2 = ρ2l2 / A2Ratio of resistances is -R1/R2 = (ρ1l1/A1) / (ρ2l2/A2)R1/R2 = (ρ1/ρ2) × (l1/l2) × (d2/d1)^2R1/R2 = (1.62×10^-8 / 4.86×10^-8) × (2) × (1/2)^2R1/R2 = (1/3) × (2) × (1/4)R1/R2 = 1/6 Therefore, resistance of wire B is SIX TIMES that of B.Hope it helps..

E WORK :the work done on an object is said to be positive work when force and DISPLACEMENT are in same direction.example: When an object moves on horizontal surface,force and displacement ACTS in FORWARD direction. So,work done is positive.NEGATIVE WORK:The work done is said to be negative work when force and displacement are in opposite direction.example: When an object is thrown upwards,the force CTS in downward direction whereas displacement acts in upward direction.ZERO WORK:The work done is said to be zero work when force and displacement are perpendicular to each other or when either force or displacement is zero.example: When we hold an object and walk,the force acts in downward direction whereas displacement acts in forward direction.please mark as brainliest answer

e here is your ANSWER it is REAL and inverted IMAGEI hope it will HELP you thank you

s the TECHNOLOGY of using RADIO WAVES to carry information, such as sound and images, by SYSTEMATICALLY modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse WIDTH.

von MAYER derived a relation between specific HEAT at constant pressure and the specific heat at constant volume for an ideal GAS. The relation is: , where CP, m is the MOLAR specific heat at constant pressure, CV, m is the specific heat at constant volume and R is the gas constant.

e wires should be of low MELTING POINT but TUNGSTEN has a high melting point.

form rainbow in classroom by using a prism . Place the prism in front of an open window . Due to the sunlight, one can observe the dispersion of light through the prism. This light gets DISPERSED into 7 COLOURS of rainbow.During or after the rainfall, tiny water droplets are present in the sky , which acts like tiny prisms. So, when sunlight falls on these droplets , it refracts at the INTERFACE of the surface of the DROPLET. This is due to atmospheric refraction. Again the refracted ray reflects internally in the droplet. And , again the reflected rays emerges out of the droplet to form 7 constituent colours. This unables us to see the rainbow thus formed.The FOLLOWING diagram can be referred ::-HOPE IT HELPS YOU!!

! You just have to REMEMBER formula of potential when work DONE and CHARGE is GIVEN .Just have a look at the ANSWER

perties of ethanol is :colourlessmelting POINT- 156kboiling point- 351kpleasent smellsoluble in water BURNING tastethe PROPERTIES of ethanoic acid colourlessmelting point- 290kboiling point- 391ksoluble in water

are closer to us. The amount of light received from them is much greater and the fluctuations caused in the amount of light due to ATMOSPHERIC REFRACTION is negligible.Hence PLANETS TWINKLE.

son natural gas is called “CLEAN” is because it emits 50 PERCENT less carbon dioxide than coal when you burn it. THUS it's seen by some as a “bridge” fuel until zero-carbon-producing renewables can take over. But natural gas isn't clean in the WAY that solar is clean. It's clean-er than coal

se a metre scale for measurement of LENGTH, it may have graduations at 1 mm DIVISION scale spacing or INTERVAL. A VERNIER scale oncaliper may have a least COUNT of 0.01 mm while a micrometer may have aleast count of 0.001 mm.

2×18×3.25×10^-2    = 1.0062       ORDER of magnitude is  32)  86400s    =    1852           ,    order of magnitude is   4 3) 4.73×10^13km  =   35              order of magnitude is  1order of magnitude is

istance in ohm's, W. V = potential difference in volts, V. I = CURRENT in AMPERES, A.

wire or ENAMELED wire is a COPPER or aluminium wire coated with a very thin layer of insulation. Insulated copper wire and insulated copper cable are among the most COMMON sources for scrap copper. Copper is one of the more lucrative metals to scrap; KEEP in mind that copper wire prices can fluctuate from day to day so be sure to LOOK for the current Insulated Copper Wire Scrap Prices.hope it helps you

versely proportionalP.S. :- the resistance of a wire is PROPORTIONAL to its LENGTH, and inversely proportional to its cross-sectional AREA. The CONSTANT of proportionality is called the resistivity of the material making up the wire. And resistivity is inversely proportional to resistance,HENCE length of wire is inversely proportional to resistivity ☺☺

resistivity and low MELTING pointP.S. A FUSE wire has HIGH resistance and low melting point so that it will melt if a current of large MAGNITUDE PASSES through the wirehope it helps ☺☺

our QUESTION in a MEANING FULL MANNER

that kinetic energy of an OBJECT is GIVEN by K=1/2mv^2differentiating with respect to time t,we get,dk/dt=d/dt(1/2mv^2)dk/dt=1/2m2vdv/dtdk/dt=Mav [a=dv/dt]dk/dt=f×dx/dtdk=fdx.therefore,TOTAL work DONE -kf-ki=W

S YOUR ANSWER ❤DISTANCE❄It is defined to be the magnitude or SIZE of displacement between two POSITIONS. PATH LENGTH ❄The distance travelled by an body is called path length. ➖➖➖➖➖➖➖➖➖➖

e for producing plane-polarized light, consisting of two pieces of optically clear calcite or ICELAND spar cemented TOGETHER with CANADA BALSAM in the shape of a prism.

value is decrease because the acid or OH release after the GAS RELEASED. Sodawater contain carbonic acid which is a weak acid so when SODA bottle is opened it releases co2 therefore the pH of solutionwill decrease.Please mark as BRAIN LIST please

te is how the atmosphere BEHAVES over relatively longer period of time. --monsoon is a seasonal shift in the prevailing wind direction, that USUALLY BRINGS with it a different KIND of weather

is a device which converts electrical energy into mechanical energy. Every motor has a shaft or spindle which rotates continuously when current is passed into it.A Motor Works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it a force act on the coil which rotates it continuously.★ It consist of a single loop of an insulated copper wire in the form of a rectangle which is known as Armature coil.★ Armature coil is placed between two pole places of the strong magnet which provide strong magnetic field which is known as strong magnetic field.★it consist of two half of magnetic ring. The two ENDS of armature coil are connected to these two half of ring. The COMMUTATOR reverse the direction of current in armature coil. ★ Two carbon brushes press against the commutator. These brushes act as contact between commutator and terminal battery.★ It is connected across carbon brushes. It supplies current to the armature coil.Working of Electric Motor★When current flow through coil,arm AB and CD experience magnetic force.★ According to Fleming’s Left hand rule,arm AB of coil experiences force in downward direction and arm CD experiences force in upward direction.★ Both these forces are EQUAL and opposite.★ 2 equal and opposite forces acting at different POSITION of armature constitute a couple.★ The couple rotate the coil in clockwise direction until the coil is in vertical position.

can't UNDERSTAND

ur ANSWER enjoy learning...(a)As the candle is moved towards the lens, the image distance INCREASES. Thus,  the student moves the lens away from the screen to focus the image. (B)The size of the image increases when the object is moved towards the lens. (c) Intensity DECREASES. (d)When the candle is moved very close to the lens, no image is FORMED on the screen. A virtual image is formed behind the candle on the same side of the screen.

ivalent RESISTANCE between P and Q is 20

e mirrors are kept at RIGHT angles to each other, the INCIDENT ray and the REFLECTED RAYS are PARALLEL to each other.

its such as:1 metric ton = 1000 KG, Quintal = 100 kg, Slug = 14.57 kg are commonly USED. The LARGEST practical unit of MASS is Chandrasekhar limit (CSL). 1 CSL = 1.4 times the mass of sun.

n :-A boy standing in a quarry claps his hands sharply once every second and heard an ECHO from the face of the opposite CUTTING. He moves until the echo is heard midway between the claps. How far is he then from the reflecting surface ( velocity of SOUND = 360 m/s ) .ANSWER :-90 mStep by STEP :-Given :The boy claps every second.So in 1 s he claps 1 time .Time He moves until the echo is heard midway between the claps.Hence the echo is heard in 0.5 sThis is because he claps in 1 s and the midway will be 1/2 s = 0.5 s.Formula Speed = distance / timeTime he heard the echo = 0.5 sLet Distance from the surface be d.The distance traveled by echo is 2 d since it has to MOVE twice from the source to reflecting surface and from the reflecting surface to the source.Speed given is = 360 m/sCalculate the distance Speed = distance / time= > 360 m/s = 2 d / 0.5 s= > 2 d = 360 m/s × 0.5 s= > 2 d = 180 m= > d = 180 m / 2= > d =90 mSorry if wrong =_=