A Nichrome wire 78 cm long and 0.25 mm in diameter is connected to a 1.4 volt fl

Question

A Nichrome wire 78 cm long and 0.25 mm in diameter is connected to a 1.4 volt flashlight battery. What is the electric field inside the wire?
V/m
The Nichrome wire is replaced by a wire of the same length and diameter, and same mobile electron density but with electron mobility 4 times as large as that of Nichrome. Now what is the electric field inside the wire?
V/m
The electron current in the first circuit (Nichrome) is i1. The electron current in the second circuit (wire with higher mobility) is i2. Which of the following statements is true?

i2 = i1Not enough information is given to compare the two currents.    i2 > i1i2 < i1

Explanation / Answer

a) V = E d

E = V / d

= (1.4) / (78 * 10-2)

electric field inside the wire = 1.79 N/C

b) electric field doesn't depend on electron mobility

E = V / d

= (1.4) / (78 * 10-2)

electric field inside the wire = 1.79 N/C

i2 > i1

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