Photonics101.com - Understand Electromagnetism!

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Our most prominent section provides worksheets to learn electrodynamics.

In this section you can learn about electrostatics, magnetostatics, circuit theory and even full electrodynamics.

Other parts of the site incorporate a blog and publications interesting to students of photonics.

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rotational symmetry

• A Cylinder Shell Current and its Magnetic Field

AmpĂ¨re's law is hard to solve in general. What if certain symmetries of a current distribution are present? We may find much simpler differential equations which might be integrated directly. Find out what to do in rotational and translational symmetry!

• Multipole Moments in Rotational Symmetry

In rotational symmetry, the multipole moments of a charge distribution are described by just one component per order l. This is a drastic difference to the usual 2l + 1 independent components. Get to know this simplifications with two examples and derive it for any charge distribution with rotational symmetry!

• The Homogeneously Charged Disk: Electrostatic Potential and Electric Field

To have a certain solution at hand is often useful construct another one out of it. This is the case for the electrostatic potential and field of the charged ring that can be generalized to the homogeneously charged disk and cylinder. Find out how to calculate the solutions on the axis of symmetry.