Two magnetic paths BE and BCDE are in parallel and form a parallel magnetic circuit, as shown in the given figure. The Ampere Turn required for this parallel circuit is equal to: 

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  1. inverse of Ampere Turn required for BE
  2. ampere Turn required for any one of the paths
  3. square of Ampere Turn required for any one of the paths 
  4. sum of Ampere Turn required for BE and BCDE

Answer (Detailed Solution Below)

Option 2 : ampere Turn required for any one of the paths
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Detailed Solution

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Concept

The reluctance in a magnetic circuit is given by:

\(R={MMF\over Flux}\)

\(R={l\over μ A}\)

 

Explanation

In a magnetic circuit, reluctance is analogous to resistance in an electrical circuit.  In the given question and diagram, two magnetic paths, BE and BCDE, are in parallel, forming a parallel magnetic circuit.

In a parallel magnetic circuit, the magnetomotive force (MMF) or Ampere-Turns (AT) across parallel branches is the same, just like voltage in an electric parallel circuit.

Hence, the correct answer is option 2.

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