The electron drift speed is estimated to be only a few mm/s for currents in the range of a few amperes. How then is current established almost the instant a circuits is closed?
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1 Two wires of equal length, one of copper and the other of manganin have the same resistance. Which wire is thicker?
2 A wire of resistance 8R is bent in the form of a circle. What is the effective resistance between the ends of a diameter AB?
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3 When electrons drift in a metal from lower to higher potential, does it mean that all the ‘free’ electrons of the metal are moving in the same direction?
4 Two identical slabs, of a given metal, are joined together, in two different ways, as shown in figures (a) and (b). What is the ratio of the resistances of these two combinations?
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5 A cylindrical metallic wire is stretched to increase its length by 5%. Calculate the percentage change in its resistance.