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  • Find the resistivity of a substance if the electrode are 2 cm apart and  4  in area with a resistance of 25n

Find the resistivity of a substance if the electrode are 2 cm apart and  4 cm^2 in area with a resistance of 25 \Omega 

Option: 1

50


Option: 2

200


Option: 3

100


Option: 4

25


Answers (1)

best_answer

As we have learned 

Electrical Resistance -

R=\frac{\rho\ l}{A}  

- wherein

\rho= resistivity of the substance

l = length

A = Area

 

 R = \frac{\rho l}{A }

25= \rho *2/4

\rho = 50 

 

 

 

 

Posted by

Kuldeep Maurya

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