7. Two wires of the same length and the same resistivity
are connected in parallel. Find the ratio of their areas of
cross section if the ratio of their electrical resistances
is 4:3
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Two wires X,Y have the same resistivity, but their cross-sectional areas are in the ratio 2:3 and lengths in the ratio 1:2. They are first connected in series and then in parallel to a.d.c. source.
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