Question

In given figure, how much energy is absorbed by

electrons from the initial state of no current (ingore

thermal motion) to the state of drift velocity ? Number

of electrons per unit volume = 1029 m–3, length of

circuit = 10 cm, cross-section area = smm)2.​

Answer 1

The value of drift velocity is Vd = 0.625 x 10^-4 m/s

Explanation:

Given data:

• Number  of electrons per unit volume = 1029 m^–3
• Length of circuit = 10 cm
• Cross-sectional area = 1 mm^2

Solution:

Ohm's law states that

Current = Voltage / Resistance

i.e.

I = V / R

Put the values

I = 6 v / 6 ohm = 1 A

The value of the current is 1 A.

The drift velocity relation is given by;

I = ne AVd

Vd - drift velocity

n = number density of electrons

By rearranging;

Vd = I / ne A

Putting the values we get

vd = 1 / 10^29 x 16 x 10^-19 x 10^-6

Vd = 1/1.6 x 10^-4 m/s

Vd = 0.625 x 10^-4 m/s

The value of drift velocity is Vd = 0.625 x 10^-4 m/s

Answer 2

Answer :-

The value of drift velocity is Vd = 0.625 x 10^-4 m/s

Explanation:

Given data:

• Number  of electrons per unit volume = 1029 m^–3
• Length of circuit = 10 cm
• Cross-sectional area = 1 mm^2

Solution:

Ohm's law states that

Current = Voltage / Resistance

i.e.

I = V / R

Put the values

I = 6 v / 6 ohm = 1 A

The value of the current is 1 A.

The drift velocity relation is given by;

I = ne AVd

Vd - drift velocity

n = number density of electrons

By rearranging;

Vd = I / ne A

Putting the values we get

vd = 1 / 10^29 x 16 x 10^-19 x 10^-6

Vd = 1/1.6 x 10^-4 m/s

Vd = 0.625 x 10^-4 m/s

The value of drift velocity is Vd = 0.625 x 10^-4 m/s