Step 1: Superconductivity Defined.
Superconductivity is the state where specific materials, at temperatures below a critical point, display absolute zero electrical resistance. This defining characteristic enables superconductors to transmit electricity with perfect efficiency, incurring no energy dissipation.
Step 2: Inferred Answer.
Consequently, the definitive response is that superconductors possess zero electrical resistance below their critical temperature, aligning with option (1).
Three identical heat conducting rods are connected in series as shown in the figure. The rods on the sides have thermal conductivity 2K while that in the middle has thermal conductivity K. The left end of the combination is maintained at temperature 3T and the right end at T. The rods are thermally insulated from outside. In steady state, temperature at the left junction is \(T_1\) and that at the right junction is \(T_2\). The ratio \(T_1 / T_2\) is 
Calculate the \(E^\circ_{{Mg^{2+}/Mg}}\) potential for the following half-cell at 25°C:
Mg/Mg2+(1 × 10−4 M), E0 Mg2+/Mg = +2.36 V