Question

If a certain piece of copper is to be shaped
into
a conductor
of minimum resistance
it's length and cross Section area will
be respectively.
9 L & A
042 & 2A
b)
2L
& A/
d) 43
4
3A​

Answer 1

Answer:

Resistance depends on length and area as follows:

R∝

A

L

Case A) R =ρ×

A

L

Case B) R =ρ

A

2L

×2=

A

ρL

×4

Case C) R =

4A

ρL

Case D) R =

A

ρL

×9

⇒ case C gives min resistance.