An external field of 1000 Volt /m maintains a current density of 0.1 `Amp/m^2`. Calculate (a) the resistivity (b) the conductivity.

The resistance of a metal wire of length 1m is 3 ohm. The diameter of the wire is 0.2 m. Calculate the resistivity of the metal at the temperature.

A cell of terminal p.d. of 10 volts drives a current of 2 Amperes calculate the emf of the cell if its internal resistance is 0.5 ohm.

The electrical resistance of a column of 0.05 M NaOH solution of diameter 1 cm and length 50 cm is 5.55 xx 10^(3) Omega . Calculate its resistivity, conductivity and molar conductivity.

5 cells each of e.m.f 1.5 V and internal resistance 0.1 Omega are connected in such a manner that the current in an external resistor of 10 Omega is maximum. Draw the circuit diagram of the combination and calculate the current in the circuit.

The resistance of a conductivity cell when filled with 0.05M solution of an electrolyte x is 100 Omega at 40^(@)C . The same conductivity cell filled with 0.01M solution of electrolyte y has a resistance of 50 Omega . The conductivity of 0.05 M solution of electrolyte x is 1.0 xx 10^(-4) S cm^(-1) . Calculate (i) cell constant (ii) conductivity of 0.01 M solution (iii) molar conductivity of 0.01 M solution

A uniform straight conductor of radius 0.25 mm carries a steady current of 2A .Calculate the current density in it.