## Question & Answer on Magnetic Circuit for Interview & Exam

**1 - How to know the Direction of Magnetic Field?**

The Direction of Magnetic Field can be Obtained by using Right Hand Thumb Rules, Where Thumb show the Direction of Current and Folding Fingers Show the Direction of Magnetic Field.

**2 - What is Magnetic Flux?**

It is the Number of Magnetic Field lines passing through a Normal Cross section area in a Magnetic Field.

It is Define as the dot Product of Magnetic Field Density (B) with Area Vector (A).

**ϕ = B.A = BA Cosθ**

S.I. Unit = Weber

If θ=0, ϕ Will be Max

If θ=90, ϕ Will be Min

**3 - What is Magnetic Motive Force (MMF) in Electrical Engineering?**

It is Responsible to Generate Magnetic Flux in Magnetic Circuit. It is Define as Product of Current Flowing in a Coil and Number of Turn of the Coil.

**Magnetic Motive Force (MMF) = NI**

S.I. Unit = Amp-Turn

**4 - What is Reluctance in Magnetic Circuit?**

It is Property of Magnetic Material which Opposes the Flow of Magnetic Flux.

F = Rϕ So

**R = F/ϕ**
S.I. Unit = Amp-Turn/Weber

**5 - What is Permeance in Magnetic Circuit?**

It is Opposit of Reluctance.

**Λ = 1/R**

S.I. Unit = Weber/Amp-Turn

**6 - What is Magnetic Field Intensity (H)?**

Magnetic Field Intensity Define as Magnetic Motiv Force(MMF)/Unit Length

**H = MMF/L**

S.I. Unit = Amp-Turn/Meter

**7 - What is Self Induction?**

Self Induction is the Property of coil which opposes any change in the current of the coil. It is Define as Linkage Flux/Unit Current.

**L = Nϕ/I**

S.I. Unit = Henry

**8 - What is Mutual Inductance?**

When the two coils are placed very near to each other and the flux of coil one also link to coil two then the induction known as Mutual Induction.

**9 - What is Coupling Coefficient?**

Coupling Coefficient Define as the Ratio of Mutual Induction to the Gematrical Mean of two Induction. (√L1L2)

**K = M/√L1L2**

**Note -**

1 - If K=1, It means 100% Coupling.

2 - If K>0.5 it means Tightly Coupling.

3 - If k<0.5 it means Loosely Coupling.

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