`sigma_(1)` and `sigma_(2)` are the electrical conductivities of Ge and Na respectively. If these substances are heated, then

Electrical conductivies of Ge and Na are sigma_(1) and sigma_(2) respectively. If these substances are heard, then

Electrical conductivies of Ge and Na are sigma_(1) and sigma_(2) respectively. If these substances are heard, then

Electrical conductivies of Ge and Na are sigma_(1) and sigma_(2) respectively. If these substances are heard, then

Two metal wires of identical dimensions are connected in series. If sigma_1 and sigma_2 are the electrical conductivities of the metal wires respectively, the effective conductivity of the combination is

A copper wire and an iron wire, each having an area of cross-section A and lengths L_(1) and L_(2) are joined end to end. The copper end is maintained at a potential V_(1) and the iron end at a lower potential V_(2) . If sigma_(1) and sigma_(2) are the conductivities of copper and iron respectively, then the potential of the junction will be

A copper wire and an iron wire, each having an area of cross-section A and lengths L_(1) and L_(2) are joined end to end. The copper end is maintained at a potential V_(1) and the iron end at a lower potential V_(2) . If sigma_(1) and sigma_(2) are the conductivities of copper and iron respectively, then the potential of the junction will be

Two metal wires of identical dimensions are connected in series. If sigma_(1) and sigma_(2) are the conductivities of the metal wires respectively, the effective conductivity of the combination is

Two metal wires of identical dimensions are connected in series. If sigma_(1) and sigma_(2) are the conductivities of the metal wires respectively, the effective conductivity of the combination is

Two metal wires of idential dimensions are connected in series. If sigma_(1) and sigma_(2) are the conductivities of the metals respectively, the effective conductivity of the combination is