A 6.00 m length of 1.6 mm -diameter wire carries a 740 mA current when 18.0 mV i

Question

A 6.00 m length of 1.6 mm -diameter wire carries a 740 mA current when 18.0 mV is applied to its ends. The drift velocity is 2.1 times 10^-5 in/s. differently or used a different number of significant figures than required for this part. If you need this result for any later calculation in this item, keep all the digits and round as the final step before submitting your answer. Determine the current density j. Express your answer to two significant figures and include the appropriate units. Determine the electric field inside the wire. Express your answer to two significant figures and include the appropriate units. Determine the number n of free electrons per unit volume. Express your answer using two significant figures.

Explanation / Answer

E)

here

the number of electrons are

j = n * e * vd

3.7 * 10^5 = n * 1.602 * 10^-19 * 2.1 * 10^-5

n = (3.7 * 10^5)/(1.602 * 10^-19 * 2.1 * 10^-5)

n = 1.0998 * 10^29 e/m^3

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