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q state maxwells right hand cork screw rule maxwellss right hand cork screw rule if a right handed cork screw is turn to advance along the direction
q define thomson effect thomson recommended that when a current flows through unequally heated conductors heat energy is absorbed or evolved
q define peltier coefficient and write its unit the quantity of heat energy absorbed or evolved at one of the junctions of a thermocouple when one
q what is temperature of inversion maintain the temperature of the cold junction constant the temperature of the hot junction is gradually increased
q what is neutral temperature maintain the temperature of the cold junction constant the temperature of the hot junction is gradually increased the
q what is seebeck effect seebeck revealed that in a circuit consisting of two dissimilar metals like iron and copper an emf is developed when the
q what is a fuse wirei fuse wire is an alloy of lead 37 as well as tin 63 it is linked in series in an electric circuitii it has high resistance as
q why nichrome is used as heating element in electric heating devices nichrome an alloy of nickel as well as chromium is used as the heating element
q state joules law of heatingthe heat produced in a conductor isi unswervingly proportional to the square of the current for a given rii unswervingly
q define critical temperature the temperature at that electrical resistivity of the material suddenly drops to zero and the material changes from
q two wires of same material and same length have resistances 5 and 10 respectively find the ratio of radii of the two wires r rhol a rhol
q an iron box of 400 w power is used daily for 30 minutes if the cost per unit is 75 paise find the weekly expense on using the iron box energy
q distinguish between electric power and electric energyelectric poweri electric power is described as the rate of doing electric workii electric
q a managing wire of length 2m has a diameter of 04 mm with a resistance of 70 ohm find its resistivity rho p x pir2 l
q what are the changes that take place at the superconducting transition temperature at the transition temperature the subsequent changes are
q give any three utilizes of secondary cells i the secondary cells are rechargeableii they have extremely low internal resistanceiii they are able to
q what are secondary cells give an examplei they are rechargeableii the chemical reactions which take place in secondary cells are reversibleiii the
q define the temperature coefficient of resistance the ratio of raise in resistance per degree rise in temperature to its resistance at 0oc is called
q the colour codes of a carbon resistor are yellow yellow orange tolerance is 5 find the resistancethe initial yellow ring corresponds to 4 the
q if 625 x 10 18 electrons flow through a given cross-section in unit time find the current solution current i q t ne t 625 x 10 18x 16 x 10 -19
q what is superconductivitythe capability of certain metals their compounds and alloys to conduct electricity with zero resistance at very low
q define current density give its unitthe amount of charge passing per unit time through unit area taken perpendicular to the direction of flow of
q the resistance of a platinum wire at 0oc is 4 omega what will be the resistance at 100oc if the temperature coefficient of resistance is 00038oc
q the resistance of a nichrome wire at 0oc is 10 omega if the temperature coefficient of resistance is 0004oc find its resistance at boiling point of
q state faradays laws of electrolysis first law the mass of a substance unconventional at an electrode is directly proportional to the charge passing