Question

the resistance of certain length of the wire having diameter 5mm is 10 ohms . if diameter is changed to 10mm, the new resistance will be? please explain​

Answer 1

Answer:

Resistance of a resistor is given by

R = ρl/A

Where ρ - resistivity of the conductor

l - length of the resistor

A - cross-section Area of the conductor

A = πr^2

r - radius of the cross section area

Resistance is inversely proportional to the cross-section Area 'A'

If r = 2.5mm becomes r' = 5mm the new area becomes 4 times initial area

A' = 4A

R' = ρl/A' = ρl/4A = R/4 = 10ohms/4

R' = 2.5ohms

Answer 2

Answer:5 ohm

Explanation:

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