An electron is placed between points A and B as illustrated below. If the electr

Question

An electron is placed between points A and B as illustrated below. If the electron moves to the left starting from rest, what are the directions of a) the electric field, b) the direction of lower potential and c) the direction of lower potential energy, respectively?

a.

left, left, right

b.

left, left, left

c.

right, left, left

d.

right, right, left

e.

right, right, right

A current of I=48A flows in the direction illustrated in the large triangular metal structure below. If the number density of electrons in the metal is n=1023 electrons/m3, what is the drift speed of electrons, vd? Use the magnitude of the charge of the electron of q=1x10-19C.

1x10-4 m/s

19x10-4 m/s

4x10-4 m/s

2x10-4 m/s

8x104 m/s

1x10-4 m/s

19x10-4 m/s

4x10-4 m/s

2x10-4 m/s

8x104 m/s

Explanation / Answer

Formula for drift speed is

vd = J /ne

= ( I/A)n e

= ( I/ 1/2 * base height) n e

= 48 A/ 1/2 * 6 * 4 * 10^23 )( 1 * 10^-19 C)

=4* 10^-4 m/s

first question figure is not opened

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