IB Physics - 11.1.1 - Flux, flux density and flux linkage

A LovattPhysics video explaining the importance and the difference between magnetic flux, flux density and flux linkage and their relationships to magnetic field strength.

[jasonlu]

I love how a sub-9 minute video explains better on flux, flux density, and flux linkage better than a textbook does in 10 pages ahaha
great video my guy

[HelloThere-phzb]

This was one of the best explanation I have seen. I like the use of the scale!

[joeeeee]

Sir you are rescuing my degree! Your videos are fantastic, please never stop! :) It is really really appreciated.

[muhammadanas]

At 4:15 theres a mistake, at 90 degrees cosTheeta will be 0 and therfore no magnetic flux will be produced.(correct me if i am wrong)

[sajza]

Thanks! Very clear. Just a quick question. In the last equation, we have 2 variables to find out. Magnetic field (B) and Fi (flux). I have to have one of those to be able to solve the equation as the N and A are easy to be found out. So, how could I work out either of those two variables? Many thanks.

[macsentiffany]

trying to teach myself magnetism during covid with no support and flux linkage has been confusing me for days until i saw this.

[amr.a-m]

Good video how much some times the value of flux?

[lots]

what a lifesaver! i finally get it oh my goodness

[skepticengineer]

You have said that B is the magnetic field strength/intensity; which is not correct. B is the magnetic flux density, and H is the magnetic field strength/intensity. Please edit your video, because people may misunderstand or get confused. Thanks.
btw, you asked in which course this video is in use to us; personally I'm using it for Electric Machinery course in EE.

[xom]

I am working N48 57 x 45 for Eddy Current Brakes . I an using multiple magnets. My question is how to increase my field strength that can be felt at longer distance to influence conductor to produce high eddy current and resultant braking force. Should I stack magnets or place magnets N-S N-S. Or any other orientation you may suggest to benefit from N48 magnets.

[mohammadalshaikhhasan]

thanks for the best simplified and practical explanation. in the videw it show F=iBL, i read in some different physic book that magnetomotive force F= Ni. can you please give more clarification about what different between this two different formula for F.

[mohammadalshaikhhasan]

from my electromechanic engineering book i have another formula used for the force (Mmf, magnetomotive force), as can be seen from bellow page scan from the book. F= ΦR (where Φ is the magnatic flux, and R is the reluctance)

Φ = BA 

R= l/uA (is is the permeability)

so F = Bl/u 


my question,

why are the two formulas not matching (the first formula from your youtube, the second formula from the book)? What did I miss and mistaken?

F= ΦR (where Φ is the magnatic flux, and R is the reluctance)

Φ = BA 

R= l/uA (is is the permeability)

so F = Bl/u 


my question,

why are the two formulas not matching (the first formula from your youtube, the second formula from the book)? What did I miss and mistaken?

And i have to thank you for the awesome and informative video

[pjnoonan]

In the initial F = IBL, is L the length of the coil overall, or the wire that makes up the coil?

[robinhooper]

So, would you say that two opposing magnets would have a greater magnetic flux density than two magnets that are attracted to one another, at the same distance apart?

[barneytwist]

Hie sir thank you for the nice video....sir whats the difference between magnetic field strength(B) and magnetic field intensity (H)?

[moratasa]

THANKK YOU VERY MUCH I HOPE YOU THE BEST!!!

[darpmosh]

For Flux Density, I don't understand: if, at any point near the proximity of a magnet, there is always a magnetic force acting on an object, why say that there are more of these lines on one area than another? if that were the case, then that would imply that at some points near the proximity of the magnet there would be NO forces at all acting on the aforementioned object.

[wingedbull]

@LovattPhysics I have two N52 Magnets Size 2"L x 1"W x 3/8"H and Magnet wire 18Awg, I will have One Magnet face North and other South But I need to make One Magnet wire Coil that both Magnets rotating 360 degrees in center of One Coil to produce at least 14 Volt and light up 150 watts light bulb, How many turns of magnet wire I need to do or have to produce what i'm looking for the out put. I look forward to your reply

[mamba]

Flux are the field lines passing through a body

[solartriumph]

Thank you sir, the video is very clear