Physics 9702/52 — May/June 2010

A current in a flat circular coil produces a magnetic field.

A student suggests that the strength $B$ of the magnetic field is related to the distance $x$ from the centre of the coil (see Fig. 1.1) by the equation

where $B_0$ is the strength of the magnetic field for $x = 0$, and $p$ is a constant.

Design a laboratory experiment that uses a Hall probe to investigate the relationship between $B$ and $x$. You should draw a diagram showing the arrangement of your equipment. In your account you should pay particular attention to

(a) the procedure to be followed,
(b) the measurements to be taken,
(c) the control of variables,
(d) the analysis of the data,
(e) the safety precautions to be taken.