1.

The resistivity of manganese wire of length 1 m is 1.84xx10^-6Omegam" at "20^(@)C. If the diameter of the wire is 3xx10^-4m, what will be the resistance of the wire at that temperature?

Answer»

Solution :Given, Resistivity `rho=1.84xx10^(-6)Omegam`
Length l = 1M, Diameter d = `3XX10^(-4)m`
Area of cross section
`A=(pid^(2))/4=22/7xx(3xx10^(-4)xx3xx10^(-4))/4=99/14xx10^(-8)m^(2)`.
RESISTANCE `R=(rhoxxl)/A=(1.84xx1xx14xx10^(-6))/(99xx10^(-8))`
= `(25.76xx10^(2))/99=26.02Omega`


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