1.

For a block with dlmensions1 cm xx 1 cm xx 100 cmhavng resistivity 3 xx 10^(-7) Omegam, find its resistance between two rectangular sides.

Answer»

`3 xx 10^(-9) Omega`
`3 xx 10^(-7) Omega`
`3 xx 10^(-5) Omega`
`3 xx 10^(-3) Omega`

Solution :`3 xx 10^(-5) Omega`
Area of RECTANGULAR cross section
A = 1 `xx 100 cm^(2)`
`= 100 cm^(2)`
`= 10^(-2) m^(2)`

Resistance R` = (rho L)/(A) = (3 xx 10^(-7) xx 1)/(10^(-2))`
= 3 ` xx 10^(-5) Omega`


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