25 points Save Aeswer Given the diameter D of a rod, what equation would you use

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25 points Save Aeswer Given the diameter D of a rod, what equation would you use to calculate its cross-sectional area? 25 points Save Answer Objects made of the same material but of different shape will have different resistivity value. O True O False A copper rod has a resistance 2.06a.When a voltage of 3.95volts is applied across the copper rod. What is the electric current (in umit of amp) running through the rod? QUESTION 2.5 points Save Answer What is the units for resistivity ? .ft O m/o 2.5 points Save Answer The resistivity value of brass is approximately 07.2× 10-8·m 05.4× 10-sa-m 05.4 x 1002-nm QUESTION 2.5 points Save Answer A metal rod has a length 19.2cm and a radius of 1.72mm, you measure the resistance of the rod to be 3.65 What is the resistivity of the metal in units of am?

Explanation / Answer

1)

Given diameter of the rod is D,

cross sectional area is A = pi*r^2

we know that diameter D = 2*r ==> r = D/2

now area of cross section is A = pi(D/2)^2

So option C is correct

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