(a)(i)Using the compass polarity shown in Fig. 7.1, mark N and S on the bar magnet.
Options
Theory: answer all nine questions. Show working and appropriate units; diagrams and alternative valid methods are marked against the original scheme.
(a)(ii)Describe how to use the Fig. 7.1 plotting compass on paper to trace the field line passing through P between the magnet’s poles.
(a)(iii)Using the Fig. 7.1 compass, explain how to find the field direction at P.
(b)(i)Fig. 7.2 shows a magnet moved into and out of a coil connected to a centre-zero ammeter. Explain why moving the magnet produces a current.
(b)(ii)Describe the Fig. 7.2 magnet motion that produces alternating current of frequency 0.50 Hz.
(b)(iii)How does the Fig. 7.2 centre-zero ammeter show the current is alternating rather than direct?
(b)(iv)Why does increasing the frequency of the Fig. 7.2 alternating current also increase its magnitude?