Physics 9702 · AS & A Level · Force on a moving charge
Force on a moving charge — practice question
As shown in Fig. 9.1, a Hall probe is positioned close to one end of a current-carrying solenoid. It is turned about the axis $XY$ and then kept in the orientation that gives the greatest Hall voltage.
(a(i))[2]
Explain why the Hall probe should be formed from a thin slice of material.
(a(ii))[1]
Explain why the current in the probe must remain constant if measurements of magnetic flux density are to be consistent.
(b)[3]
The probe is now turned through $360^{\circ}$ around the axis $XY$. At $\theta = 0$, the Hall voltage $V_H$ has the maximum value $V_{\text{MAX}}$. On Fig. 9.2, sketch how Hall voltage $V_H$ varies with angle $\theta$ for one complete turn of the probe about axis $XY$.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Hall voltage is affected by the thickness of the slice” …