A wire of 5.8m long, 2mm diameter carries 750ma current when 22mv potential difference is applied at its ends. if drift speed of electrons i

Question

A wire of 5.8m long, 2mm diameter carries 750ma current when 22mv potential difference is applied at its ends. if drift speed of electrons is found then:_________.
(a) The resistance R of the wire(b) The resistivity p, and(c) The number n of free electrons per unit volume.​

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Thu Cúc 3 years 2021-08-08T13:17:58+00:00 1 Answers 589 views 0

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    2021-08-08T13:19:15+00:00

    Explanation:

    According to Ohms Law :

    V = I * R

    (A) R (Resistance) = 0.022 / 0.75 = 0.03 Ohms

    Also,

    r =  \alpha  \frac{length}{area}  =   \alpha  \frac{5.8}{3.14 \times 0.001 \times 0.001}

    (B)

     \alpha(resistivity)  = 1.62 \times {10}^{ - 8}

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