A current, i , is flowing through a cylindrical segment of conductive material w

Question

A current, i, is flowing through a cylindrical segment of conductive material with a shape as shown.

VA is the voltage on the left side of the segment.  VB is the voltage on the right side of the segment. The material has a resistivity .

How can you increase the current, i, through the segment? Assume you can change anything about the situation through some physical means. Also assume you only change the one thing given in the answer and nothing else. Choose all that are correct.

A:Increase VB

B:Increase r

C:Decrease VA

D:Decrease

E:Decrease

F:Increase VA

G:Decrease VB

H:Decrease VB

-An explanation would be appreciated, thank you!

Explanation / Answer

i = V / R

to increase curent - we have to increase potential difference.

for that Vb - > increase or Va -> decrease

Or we can decrease R

R = rho L / ( pi r^2)

r -> increase or rho - decrease.

Ans: A B C

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