Mod-02 Lec-02(b) GATE Problem on Magnetic Circuits

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[hillolphukan]

sir i am confused with the air gap area. from my view point it should be (55-50)=5mm^2

[ShubhamSharma-rslg]

In Q1 Reluctance Depends on both arms area when calculated for first case (vertical arm ) and path that contains both area do not change in second case (horizontal arm ) . So L will be same ??? Is Iam thinking wrong please point out mistake

[srinuk]

sir I think ans for first question is
doubled becoz reluctance seen by both the cases remains same
but no if turns will increase in second case because of less circumference by doing in this way I got option a

[ayush]

sir in first question...the reluctance experienced by flux remains same for both cases..so how does mutual inductance changes.i.e flux flow through same path in both cases

[harinath_mishra]

sir e=4.4nf fi ka derivation kis video me

[vikasbaghel]

In question 1, equivalent reluctance of the core remains same since the only change is in the positioning of mmf source but the overall reluctance of the core remains same . This means the mutual induction should remains same. Correct me if I am wrong.

[kiruthikat]

Sir how did you calculated Ag... why did you multiplied by 1.1 and
Please explain it sir

[whistlingpandey]

What will be the mutual inductance if one coil is wounded across 20cmsq and another across 10cmsq?

[ajaychopra]

In second question. Is the core circular or is it the radius of cross section of core which is halved.

[mndsaini]

@3.38 sir... No load constant hoga toh emf kaise constant h?

[AkashSharma-ndgi]

Sir, in the first question the cross sectional area of the limb on which the winding is wound is halved, but the path traverse by flux and hence the equivalent reluctance of the path is still same. I think, the mutual inductance should be the same. Please clear my doubt

[darmalagayatri]

Sir Why you have taken infinite permeability in last qes

[harikrishna]

The approach to the first question of this video is doubtful. Because in the question, case was "If the TWO windings were wound instead on OPPOSITE HORIZONAL ARMS".... not one on the vertical and other on the horizontal arm. So the answer would be "doubled". Please clarify me if I went wrong with my statement.

[ShubhamKumar-kpjx]

Respected sir
In most of coaching materials ans of question no 1 is option A "Double"... Totally confused