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What type of magnet is made use of to produce large force through a relatively small distance?

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What type of magnet is made use of to produce large force through a relatively small distance?

(a) flat-faced armature type

(b) horse shoe type

(c) flat-faced plunger type

(d) flat-faced plunger type and horse shoe type

This question was addressed to me in semester exam.

This key question is from Types of Electromagnets topic in portion Design of Electromagnets of Design of Electrical Machines

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The correct option is (a) flat-faced armature type

Explanation: There are 3 types of most commonly used electromagnets. The flat faced armature type electromagnet is made use of to produce large force through a relatively small distance.

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