The size of a carbon block, having specific resistance. `3.5xx10^(-3)Omega-cm` is `2cmxx2cmxx2cm`. The resistance of the block between two square end

Question

The size of a carbon block, having specific resistance. `3.5xx10^(-3)Omega-cm` is `2cmxx2cmxx2cm`. The resistance of the block between two square end

The size of a carbon block, having specific resistance. `3.5xx10^(-3)Omega-cm` is `2cmxx2cmxx2cm`. The resistance of the block between two square end faces and two opposite rectangular faces are respectively
A. `17.5xx10^(-4)` and `1.75xx10^(-4)Omega`
B. `1.75xx10^(-4)` and `175xx10^(-4)Omega`
C. `175xx10^(-4)` and `1.75xx10^(-4)Omega`
D. `1.75xx10^(-4)` and `17.5xx 10^(-4)Omega`

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - C
Specific resistance
`rho = 3.5xx10^(-3)Omega -cm`
`rho =R(A)/(l)rArr R = (rho l)/(A)`
Resistance R between square faces
`= (3.5xx10^(-3)xx20)/(4)=17.5xx10^(-3)=175xx10^(-4)Omega`
Resistance between opposite rectangular faces
`R = (3.5xx10^(-3)xx2)/(2xx20)=1.75xx10^(-4)Omega`

4 views Answered 2023-02-05 15:29