Question

Resistance of a metal wire of length 2m is 35ohm at 30°C. If the diameter of the wire is 0.4mm, what will be the resistivity of the metal at that temperature?

Answer 1

Let the special resistivity be p .

Let the resistance be R.

Let the length be l.

Let radius be r .

Formula for resistance .

R = p × l / a

Given information

R = 35 Ω

r = diameter / 2

= > r = 0.4 mm / 2

= > r = 0.2 mm

= > r = 0.2 × 10⁻³ m

l = 2 m

R = p × l / a

= > 35 = p × 2 / 0.2 × 10⁻³

= > 2 p = 35 × 0.2 × 10⁻³

= > p = 7/2  × 10⁻³

= > p = 3.5 × 10⁻³

ANSWER :

The resistivity is 3.5 × 10⁻³ ohm meters.

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Answer 2

Hi there here's your answer

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