Physics 9702/52 — May/June 2014

Cambridge A-Level · Planning, Analysis and Evaluation · worked solutions for every part, with the mark scheme

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Topics Analysis, Conclusions and Evaluation · Planning

Q115MPlanningAnalysis, Conclusions and EvaluationFree sample

Two identical coils are connected together and arranged as shown in Fig. 1.1.

Fig. 1.1

The coils are in the vertical plane and are parallel to each other. When the coils are connected to a power supply, there is a magnetic field between them.

It is suggested that the magnetic flux density $B$ of the field at the point X is related to the radius $r$ of the coils by the relationship

B = \frac{0.72\mu_0NI}{r}

where $N$ is the number of turns on each coil, $I$ is the current in the coils and $\mu_0$ is the permeability of free space.

Design a laboratory experiment that uses a Hall probe to test the relationship between $B$ and $r$ and determine a value for $\mu_0$ . You should draw a diagram, on page 3, 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.

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