Question

In case of 4 wires of same material the resistance will be minimum when it's length and diameters are respectively ?

a.2l and (d/2)

b.l/2 and 2d

c.l and d

d.2l and d

Answer 1

b. as we know that resistance is directly proportional to the length of the wire and inversely proportional to the diameter
....
then resistance will be minimum when:
l/2 and 2d

Answer 2

Answer:

Resistance will be minimum when the length and diameters of the wire are l/2 and 2d.  

Explanation:

• The formula for calculating the resistance is, R = ρ(L/A)
• where R = resistance,  ρ = resistivity, L = length, A = cross-section area.
• So Resistance will be minimum for the shortest length and biggest area, that is L/2 and diameter 2D  

To learn more about resistance :

https://brainly.in/question/19540047

To learn more about resistivity :

https://brainly.in/question/1093236

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