The presence of which magnetic feature best explains why a magnet can act at a distance on other magnets or on objects containing certain metals? a) fields b) dipoles c) domains d) forces

Answer

A.Fields

Explanation

The presence of a magnetic field best explains why a permanent magnet can act upon another magnetic object whilst being at some distance. Magnetic field lines emanate from the north pole, curve around the magnet and reconnect to the south pole. The strength of the magnetic field lines decrease as you get further away from the magnet.  

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the higher the current the higher the mag field around it the higher the influence on the compass