@nm I appreciate your help

@Carl Love Good advice. I will follow it.

@acer Thank you for this. I will avoid using concatenated names from now on.

@acer I was not aware of the power of rationalize, so thank you for showing this to me.

@Rouben Rostamian  The solution to Harvard problem 15 is interesting. I was not up to it myself, but I found it and copied it from some web site, though I've since lost that location's address.

@mmcdara I am impressed and astounded that a physics problem can be solved by a completely non-physics approach. Bully for you!

@Rouben Rostamian  Another great reply from you!

From an old list of Harvard weekly problems; with a given mass and a uniform density, this shape produces the greatest gravitational force at the origin.

@gkokovidis Based on djc561's recommendation above, I am exploring Micro-Cap at this time.

Depending on how I do, I may go on to explore your recommendation.

@djc I have installed Micro-Cap and begun to practice its capabilities by following Chapter 3 of the user manual.

I am deeply impressed by its sophistication, which is far above my needs. Hopefully I can become familiar enough with its simpler features to do simple circuit analysis.

Thank you very much for the reference

@tomleslie I'll do as you suggest.

@acer I would like to use a component featured circuit analyser but can't justify the cost of MapleSim.

@tomleslie

I greatly appreciate the time you have taken to give me an example of a Syrup analysis.

Far from an expert, I have only ever dealt with simple LRC circuits so Syrup may have all the capability I need.

Is there a better free package for simple circuit analysis?

In your example, is LPckt a Spice-like circuit definition? Is it better to use this than the ladder specification of a circuit?

Is there anywhere a collection of Syrup examples to which you can refer me?

@Joe Riel Thanks for the quick response.

I will give the cloud version of Syrup a try.

@acer Thanks for the advice.

I have attempted the same display using fieldplot and it works well.

However I find fieldplot3d's displays are hard to visualize e.g. the magnetic field through a current carrying ring. Do you have any advice for improving the appearance of this kind of display?

@vv Thank you vv. Please see my reply to Carl Love