Two metal wires of identical dimensions are connected in series. If v 1 and v 2 are the conductivities of…

1. $\frac{{\mathrm{\sigma }}_1+{\mathrm{\sigma }}_2}{2\mathrm{ }{\mathrm{\sigma }}_1\mathrm{ }{\mathrm{\sigma }}_2}$
2. $\frac{{\mathrm{\sigma }}_1+{\mathrm{\sigma }}_2}{{\mathrm{\sigma }}_1\mathrm{ }{\mathrm{\sigma }}_2}$
3. $\frac{{\mathrm{\sigma }}_1\mathrm{ }{\mathrm{\sigma }}_2}{{\mathrm{\sigma }}_1+{\mathrm{\sigma }}_2}$
4. $\frac{2\mathrm{ }{\mathrm{\sigma }}_1\mathrm{ }{\mathrm{\sigma }}_2}{{\mathrm{\sigma }}_1+{\mathrm{\sigma }}_2}$

Solution

Asked in: NEET 2015 (Phase 2)

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