Question

A wire 1.0m long, 0.2m in radius has a resistance of 10Ω. Calculate the resistivity of the material.

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Answer 1

Answer:

L = 1.0 m, D = 0.2 mm

, r = 0.2 /2 mm

= 0.2/2× 1000m = 1 × 10power -4 m

R = 10 ohm.

P=?

Here, We know that

P = RA /l

= R × πr2/l

So that,

10× 3.14×(1×10power- 4 )square

/1.0

The answer is :.

{ 3.14 × 10 power -7 ohm m.}

Explanation:

Answer 2

Answer:

Explanation:

R=10 ohm r=0.2 m l=1m

By using formula

rho=RA/L

=(10×22×0.2×0.2) / (7×1)

=( 10×22×0.04) / (7)

= (220×0.04) / (7)

=8.8 / 7

=1.257 ohm m