(a)[4]
Describe how the steel bar may first be magnetised, and then how the steel bar can be demagnetised.
(b)[3]
Predict, using a suitable calculation, whether the fuse will blow when the current in the primary coil is 0.20 A.
Physics 0625 · IGCSE · Simple phenomena of magnetism
Simple phenomena of magnetism — practice question
Fig. 8.1 shows a coil wrapped around a steel bar that is at first unmagnetised. Any suitable power supply may be joined between terminals A and B. No other apparatus is available.