A-LevelPhysicsMagnetic fields9702/42 · May/June 2017 · Q96 Marks
A Hall probe is placed near to one end of a current-carrying solenoid, as shown in Fig. 9.1. [Figure 9.1] The probe is rotated about the axis XY and is then held in a position so that the Hall voltage is maximum.
- (a)(i)a Hall probe is made from a thin slice of material,[2]
- (a)(ii)in order for consistent measurements of magnetic flux density to be made, the current in the probe must be constant.[1]
- (b)The probe is now rotated through an angle of 360° about the axis XY. At angle θ = 0, the Hall voltage V_H has maximum value V_MAX. On Fig. 9.2, sketch the variation with angle θ of the Hall voltage V_H for one complete revolution of the probe about axis XY. [Figure 9.2][3]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- [C1] Hall voltage depends on thickness of slice
- [A1] thinner slice, larger Hall voltage
- [B1] Hall voltage depends on current in slice
- [B1] sinusoidal wave, one cycle
- [B1] at θ = 0 and at θ = 360°, VH = VMAX
- [B1] at θ = 180°, VH = -VMAX
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →