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(i) Define electrical conductivity of a ...

(i) Define electrical conductivity of a wire. Give its SI unit.
(ii) High current is to be drawn safely from (1) a low-voltage battery, and (2) a high-voltage battery. What can you say about the internal resistance of the two batteries ?
(iii) Calculate the total energy supplied by the batteries to the circuit shown in the figure, in one minute.

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