Plotting Magnetic Field Lines

A simple experiment demonstrating how iron filings may be used to plot field lines around:
A single magnet
Two magnets (repelling)
Two magnetic (attracting)
A current carrying wire
A current carrying solenoid (a long coil)

The basic technique is:
Cover the magnets with paper (or place paper in the area you will be scattering the filings)
Gently shake a few iron filings on to the paper.
Tap the paper gently to help the iron filings settle into a pattern.

The field line for the current carrying wire are very faint and difficult to see. This is because the field that is produced is very weak. If you look carefully, though, you may be able to make out some concentric circles going around the wire.

[prithvirajsinghrathore]

This man is making my interest in physics.

[tacocatt]

This is so clear and makes so much sense! Wish more labs demonstrations felt this way lol. Very useful especially considering covid and online learning! Virtual labs just aren’t the same

[banyon]

Love your videos! No special effects and annoying jingles and stuff. Just pure experiment and the satisfying natural sounds they emit.

[rodun]

21:10 - looking at a diagram showing magnetic field lines of two dipoles inline, but spaced apart
21:11 - confused about why the lines are drawn a certain way
21:12 - wishing I paid more attention in class a couple years ago
21:13 - finding this video
21:14 - pure satisfaction finding out exactly what I wanted to know

MANY THANK

[pestoppers]

Where are u from? Plz upload videos daily...i feel so good in watching your videos...wow

[soubhikghosh.]

Your Demonstration Makes Physics Very Intresting... Thank you so much for Developing Intrest.

[tacocatt]

Careful not to mix up “tiny metal powder” with “pepper shaker” 😆

[mprathik]

very well demonstrated... so far i understood that flux lines are an imaginary line. but this presentation tells that we have practical demonstration also available

[durvapathak]

Sooo satisfying to watch, and helpful too!✌

[nothinginteresting]

Magnetic field lines may actually be circles.

Consider a bar magnet. The two poles of the magnet can be considered as two points and the length of the bar magnet can be represented by a segment joining those two points.

Now construct a perpendicular bisector of this segment. Then for every point in this perpendicular bisector, construct circles whose radii are equal to the distance of the given point from the endpoints of the segment. You will create multiple circles passing through both the endpoints. If you construct enough circles by hand or software (recommended), you will see a pattern start to emerge that looks very much like the pattern exhibited by the magnetic field lines of a bar magnet. Try it.

While I cannot be sure that it is the exact pattern exhibited by the bar magnet, it looks a lot like it.

[manishanirkumar]

Awesome! I actually think you’re making magic to make a magnet 🧲 field

[Yoongistangerine]

First time seeing it virtually after learning from the book ☺️☺️☺️💗💓💗

[sridharbhamidimarri]

This was good but turning on the switches after placing the metal on paper will give more visual explanation.

[rakeshsaharma]

From where I can get these appliances?

[dz]

Nice job, if i was your teacher ill give you 100%

[edbunkers]

Could one stack 2 magnets staggered to reliably get an S shape from the powder?

[tomcarboni]

What kind of magnet did you use here - steel, ferrite, or alcino? Is one magnet type better than another to see the magnetic field?

[abbasmerhi]

what is that powder or metal u put on the papper ?

[vijaybhaskarvaddadi]

Which powder has to use to magnetic line

[tqaquotes]

honestly made video . so many demonstrations very quickly . 👍😍❤♥