Electromagnetic Induction: Square Loop Across a Magnetic Field

Physics Ninja looks at an electromagnetic induction problem of a square loop moving at constant velocity across a magnetic field region. I look at the induced EMF and currents and the force required to move the loop across the field region

[juniorcyans]

I took physics 2 in my second semester, but last semester, the third semester, when I started to be a physics tutor, I almost forgot all I learned before! I'm physics major. This semester I'm a mentor of physics 1 and tutor as well, I really need something like this that combines all the concepts just by one shot to refresh! Thank you very much!

[thabosithole]

Ahhh finally I found you... thank you 😊 very much, you saved me.

[derickblacido]

the magnetic force is upward by using left-hand rule (3:09). Or if not can you explain "why"?

[marcoponts]

Thanks for the video. However, nobody explains why we only need to look at the flux, meaning the field inside the loop. Even if the loop is not inside the field, the magnetic field produces an electric field in the loop. or not? And even when we're the field-region, why are we only looking at the field inside the loop? --> Please don't answer with "because of Faraday induction" or "because of Lenz's rule". I know those rules. I want to understand the physics and how to see that the electric fields created by the magnetic field lines outside the loops aren't relevant.

[sukantanayak]

Actually the question is..
" A square loop of side a is so placed that its top side is in a uniform horizontal magnetic field B normar to the plane of the loop and the lower side is outside the field and horizontal. The resistance of the loop is R and mass is M ...then what is the terminal velocity if the loop is allowed to fall under the action of gravity?

[wajeehazia]

3:09 the direction of force on electrons is upward
Isn't it?

[higgsboson]

How to find induced EMF in a circular coil moving with velocity v=5m/s in a uniform magnetic field of B tesla. The field region is rectangular extended to length 10m and and the radius of coil is 2m.

[laisguizelli]

Professor, could you help me? I think that the answer of this question is zero, is it correct?
Two metal rectangular conducting spires, named a and b
move at constant speeds to a region where there is an uniform magnetic
field B pointing out of the page, orthogonal to the spires. Use Faraday’s
law to show how the electromotive force in the spires a and b relate to
each other when their whole areas are immersed inside the magnetic field
B. Consider that the spire areas (Aa and Ab) are such that Ab = Aa/2.
Thank you a lot you teach very well and your english is easy to understand! Congratulations!!

[crimzonsoulthebest]

Dr, consider you have this square loop stationary on the horizontal xy plane same as this example, then you brought a bar magnet with the south side closer to the loop, letting the bar magnet pass by the loop along the +x axis, will there be induced current in the loop, if so, can you help it out with solution showing B vectors and any other details we need to know that there will be induced emf or not. Most teachers are saying there is no emf but am not convinced. Appreciate it

[Sunscreen]

6:29 how does the formula for the Force F_B change if instead of a square loop, we had a rectangle, lets say the bottom and top where twice the size of the 2 sides.How hould that change the formulas?

[BHARGAV_GAJJAR]

Well here is a physics question how did the loop move inside the 'x' field region did you push it ?

[enqiyang]

3:28 How do you know the Force is downwards? Is it because the Magnetic field points into the screen?

[antoniakowalewski]

According to my textbook, "if the bar has some resistance, this resistance is like the internal resistance of any other kind of battery, and V=vBL–R(internal)I". If this is the case, why isn't the current I=V/R=(vBL-RI)/R => I=vBL/2R ?

[BSingh-onqr]

Thanks. You helped me with a quiz I had to do

[tawfiqabuaita]

What if the coil is circular ?

I got (2*pi*v*L*(N^2)*(B^2))/R
If it was circular.

[richardverecompton]

I have just built a table top demonstrator? I can change the 2 pole magnet:- I can also change the coil configuration etc. Who can I sell this clever bit of kit too ????

[navyakukreja]

What if it's moving with a constant acceleration?

[jordanglass]

What if this loop was on the top of the magnetic field? What emf and current would that produce? I.e. the square is halfway outside of the magnetic field on the top, and has a velocity to the right

[johntyburski]

Bro, your handwritten phi and zero look identical. This has never caused an issue for you before?

[sukantanayak]

What if I am asked to find the terminal velocity for that loop of mass m allowed to fall under the action of gravity leaving the magnetic field?