B: iron
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The diagram shows a d.c. motor. Why is a split-ring commutator used?
A magnet is pushed slowly into a coil and there is a current in the coil in the direction shown. The magnet is then p…
Which list contains an example of a non-magnetic material, a magnetic material and a magnetised material?
A manufacturer measures accurately the dimensions of a wooden floor tile. The approximate dimensions of the tile are …
Which pair of quantities includes one scalar and one vector?
The speed-time graph represents the journey of a car. The dots separate different sections of the journey. There are …