
(a)
The drift velocity of electrons.
(a)

Answer to Problem 123P
Drift velocity is
Explanation of Solution
Concentration of free electrons is
Write the equation for drift velocity.
Here,
Conclusion:
Substitute
Therefore, the drift velocity is
(b)
The hall voltage measured by the meter.
(b)

Answer to Problem 123P
Hall voltage is
Explanation of Solution
Concentration of free electrons is
Write the relation between electric force and magnetic force on electron at equilibrium.
Here,
Write the equation for
Here,
Write the equation for
Here,
Rewrite equation (I) by substituting equations (II) and (III).
Write the equation for hall voltage.
Here,
Rewrite the above relation by substituting
Conclusion:
Substitute
Therefore, the hall voltage is
(c)
The side of voltmeter with higher potential.
(c)

Answer to Problem 123P
The left side of voltmeter is at higher potential.
Explanation of Solution
The higher potential side can be identified from the direction of electron flow. Electrons flow from higher potential side to lower potential side.
Here, electrons towards right side of voltmeter. That is, the left side of potentiometer is at higher potential. Therefore, the left side of voltmeter is at higher potential.
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