1.

If rho pis the resistance in ohm of a centimeter cube, generally called the specific resistance of the substance constituting the conductor, the resistance r of the layer containing "a" cubes is given by

Answer»

`1/R = (1)/(RHO) + (1)/(rho)+….`
`1/r =(1)/(rhoa)+ (1)/(rhoa)+…`
`r=a//rho`
`r= rho + rho +….`

SOLUTION :Reciprocal of resistance is conductance. We can add the conductance and not resistance.
Hence `1/tau = 1/rho + 1/rho +……..`


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