Figure 1 shows a coil (solenoid) wrapped around a plastic PVC pipe. A current flows in the coil in the direction of the arrow.
Figure 1
On Figure 1, draw the magnetic field lines around the coil.
Add arrows to show the direction of the field.
A long soft iron bar is placed inside the PVC pipe. State the name of the device when current flows in the coil.
Current in a wire travels into the plane of the page, indicated by a cross in Figure 2.
Figure 2
Draw lines to represent the magnetic field generated by this current.
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