Question

A copper wire has a diameter of 0.5 mm and a resistivity of 1.68 x 10-8 ohm m What will be the length of this wire be to make its resistance 2 ohm? Class 10 physics Best answer will be marked BRAINLIEST or spamming will be reported asap

Answer 1

Answer:

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Answer 2

Answer:

Length of the wire = 24.54 m

Explanation:

Given,

Diameter = 0.5 mm = 0.0005 m

Resistivity ρ = 1.68 * 10⁻⁸ Ωm

Resistance R = 2 Ω

Area of cross section A = π(d/2)²

Let us assume length of the wire as l.

We know that,

R = (ρl)/A

Then,

l = (RA/ρ)

 = {2 * 3.14 * (0.0005/2)²}/{1.68 * 10⁻⁸}

 = (2 * 3.14 * 25)/(4 * 1.6)

 = 24.54 m

Therefore,

Length of the wire = 24.54 m

Note : In the above answer, he has taken resistance as 10 ohm but in the given question it is 2 ohm.

Hope it helps!