Archive for April 3, 2014

An Inspirational Photograph..

Posted in Biographical on April 3, 2014 by telescoper

Getting home and feeling a little jaded after a very long day, I saw this photograph and decided to post it here because I think it’s inspirational.

The picture shows a visiting group of A-level physics students being given a guided tour of the Sussex University campus by Daniel, one of our first-year Theoretical Physics students.

You can see Daniel on the right of the photograph, with the white stick. He’s blind.

A Problem of Capacitors

Posted in Cute Problems, The Universe and Stuff with tags , , on April 3, 2014 by telescoper

Time for another entry in the Cute Problems  category. I’ve been teaching a course module  in theoretical physics this term so here’s one that my students should find a doddle…

A spherical capacitor consists of an outer conducting sphere of fixed radius b and a concentric inner conducting sphere whose radius a can be varied. The space between the spheres is filled with air which has a breakdown electric field strength E0. What are the greatest achievable values for (i) the potential difference between the spheres, and (ii) the electrostatic energy stored in the capacitor?

Answers via the comments box please.