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the field resistance of a dc machine is 50 ohm at 20oc the resistance increases to 55 ohm at 50oc find the temperature coefficient of the resistance
the resistivity of pure copper is 156 micro-ohm -cm an alloy of copper contains 1 atomic percent nickel has a resistivity of 281 micro-ohm-cm an
the resistance of a wire is 60 at 25oc and 65 at 75oc find the resistance of wire at 0oc and value of temperature co-efficient at 0o cansgiven r25
a heater element is made of nichrome wire having resistivity equal to 100 times 10-8 ohm-m the diameter of the wire is 04mm calculate the length of
an electric heater element is made of nichrome wire having resistivity equal to 100 times10-8
explain diffusiondiffusion though the mobility of the carriers in a semiconductor is greater than the electrons in metals the conductivity in the
explain mobilityaverage drift velocity of electrons e- in an applied field is proportional to the field the absolute magnitude of the proportionality
give the properties and application of permanent magnetic materialspermanent magnetic materialsproperties permanent magnetic materials have a huge
explain the energy bands in solids there are as several energy bands in a solid as there are energy levels in the parent atomsmany electrical
explain effect of frequency of applied electric fieldif an external electric field is applied the distance among charges that is related to chemical
explain dipolar polarizationdipolar polarization is a polarization which is particular to polar molecules such polarization results from permanent
explain ionic polarizationionic polarization is polarization that is caused by relative displacements between negative and positive ions in ionic
explain electric polarizationelectric polarization this polarization density is the vector field such expresses the density of permanent or induced
explain the different types of polarizationspolarizations are of three typesi electric polarizationii ionic polarizationiii dipolar
explain einstein relationeinstein relationthere exists a significant relation between the diffusion constant and the mobility it is termed as the
write shorte note on carboncarbon the rate of commutator wear in electrical machines is greatly decreased by using brushes made of carbon carbon c is
write short note on dielectric constantall insulation material has the capacity to store charge while placed in among two conducting plates as in
discuss applications of dielectrics application of dielectricsfor various applications various properties of dielectric materials are required as
explain polymers and their applicationspolymeric materials or plastics contain a large group of organo or organic metallic high molecules compound
explain electrical contact materialselectrical contact materials some elements in their relatively pure forms as copper nickel molybdenum palladium
explain iron and silicon iron alloys iron galvanised steel and iron wires that are usually used for earth conductor in low voltage distribution
explain polarizationpolarization a dielectric has molecules the atomic nuclei of that are effectively fixed related to each other in absence of any
explain temperature dependence of electrical resistivity and conductivity in semiconductors the electrical conductivity of the semiconductors changes
explain temperature dependence of electrical conductivity and resistivity in conductorswhen the temperature is increased there is a greater thermal
explain the properties of high resistivity materialshigh resistivity materials the conducting materials containing resistivity from 10-6 to 10-3