Physics 5054/41 — October/November 2015
Cambridge O-Level · Alternative to Practical · worked solutions for every part, with the mark scheme
Topics Experimental Contexts · Use of Techniques, Apparatus and Materials · Planning Experiments and Investigations · Analysis, Conclusions and Evaluation
When freely suspended, a bar magnet will come to rest pointing in a north-south direction.
State which pole of the bar magnet points towards the geographic north of the Earth.
______
In order to find the direction of geographic north, the magnet must be able to rotate freely in a horizontal plane.
Describe a method of supporting the magnet in air so that it can rotate horizontally.
You may use a diagram in your answer.
One student suggests floating the magnet on water. Describe how the magnet can be supported on water so that it is able to rotate freely.
You may use a diagram in your answer.
State and explain which of the methods in (b) allows the magnet to stop rotating in the shortest time.
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