A student constructs an electromagnet by winding a length of wire round a piece of soft iron and linking it into a circuit, as illustrated in Fig. 1.1. He then closes the switch and determines the greatest number of paperclips that remain attached to one end of the soft iron.
(a)[2]
State two changes to the apparatus that would make the current larger.
(b)[3]
Fig. 1.2 shows the paperclips remaining on the soft iron for three different currents. In the space provided, draw a table to present the results of this experiment.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Add another cell” …