Resistance And Resistivity

Specific Resistance or Resistivity

(a) Define resistivity. Write an expression for the resistivity of a substance. Give the meaning of each symbol which occurs in it. (b) State the SI unit of resistivity. (c) Distinguish between resistance and resistivity. (d) Name two factors on which the resistivity of a substance depends and two factors on which it does not depend. (e) The resistance of a metal wire of length 1m is 26 Omega at 20^(@)C . if the diameter of the wire is 0.3mm, what will be the resistivity of the metal at that temperature?

Factors Affecting Electrical Conductivity Of Electrolytic Solutions|Ohm's Law|Resistance |Resistivity Or Specific Resistance|Conductance|Conductivity|Molar Conductivity |Relation Between Conductivity And Molar Conductivity |Summary

In the circuit shown, both cells are ideal and of fixed emf, the resistance of resistance R_(1) has fixed resistance and the resistance of resistor R_(2) can be varied (but the value of R_(2) is not zero). Then:

Temperature coefficient of resistance alpha and resistivity rho of a potentiometer wire must be

Questions Based On Kirchhoff's Voltage Law|Resistance In Series|Resistance In Parallel

In the network shown in figure, the ring has zero resistance. Find the resistance between A and B.

The ratio of the shunt resistance and the resistance of a galvanometer is 1*499 . If the full scale deflection current of the galvanomter is 2mA , the range of ammeter is