Resistivities of copper, silver and manganin are `1.7 xx10^-8 Omega m, 1.0 xx 10^-8 Omega m and 44 xx 10^-8 Omega `m respectively. Which of these is the best conductor?

Resistivities of copper, constantan and silver are 1.78 xx 10^-8 Omega m, 4.91 xx 10^-8 Omega and 1.6 xx10^-8 Omega m respectively. which is the best conductor and why?

Resistivities of copper, constantan and silver are 1.78 xx 10^-8 Omega m, 4.91 xx 10^-8 Omega and 1.6 xx10^-8 Omega m respectively. which is the best conductor and why?

Compare the following numbers 2.7 xx 10^12 , 1.5 xx 10^8

Three cells of emf 2.0 v, 1.8 V and 1.5 V are connected in series. Their internal resistances are 0.05 Omega, 0.7 Omega " and " 1 Omega respectively. If the battery is connected to an external resistor of 4 Omega via a very resistance ammeter, what would be the reading in the ammeter ?

Write the nature of the material having resistivity of the order of 1.7 xx 10^-8 Omega m

Two wires of equal length, one of aluminium and the other of copper have the same resistance. Which of the two wires is lighter? Hence explain why aluminium wires are preferred for overhead power cables. ( rho_Al = 2.63 xx 10^-8 Omega m, rho_Cu = 1.72 xx 10^-8 Omega m . Relative density of A1 = 2.7, of Cu = 8.9.)

A wire of length15m (meter) and uniform area of cross section 6.0 xx 10^-7 m^2 has resistance of 5.0 Omega (ohm). What is the resistivity of the material of the wire ?

A wire of length 2.0 m, diameter 1.0 mm has 50 xx 10^-3 Omega (ohm) resistance. Calculate the resistivity of the material of a wire.