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When the length of the material increases, what happens to reluctance?

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When the length of the material increases, what happens to reluctance?

(a) Increases

(b) Decreases

(c) Remains the same

(d) Becomes zero

I got this question in quiz.

I'm obligated to ask this question of Reluctance topic in portion Simple Magnetic Circuits of Basic Electrical Engineering

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The correct choice is (a) Increases

For explanation: Reluctance is directly proportional to the length of the material hence as length increases, reluctance also increases.

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