Recent content by Mind----Blown

yes, i get that but still, how do we arrive at those formulae? i tried using vectors and their components method but it doesn't work

Hi everyone, to find the draw the direction for a given miller index say, [1234] we first convert this miller index consisting of 4 indices into one containing 3 indices. To do so, we have a set of formulae prescribed in almost every book. Sadly I haven't been able to come across a single book...

thanks!

Suppose i have an equilateral triangle and i want to find the principal axes of rotation passing through one of the vertex. How can i do that? I am thinking along the following lines but I'm not too sure: 1)Since the equilateral triangle has symmetry about a median, that definitely is one...

I was solving the problems given by Griffith in his book 'Introduction to Electrodynamics' and stumbled across this question. "Because sigma (conductivity of the medium) is a function of position, the equation 7.5 does not hold" --i get this point; current density isn't constant and so its...

How do i get an idea, or a 'feel' of the components of the acceleration in polar coordinates which constitute the component in the eθ direction? from what i know, a= (r¨−rθ˙^2) er + (rθ¨+ 2r˙θ˙) eθ ; (where er and eθ are unit vectors in the radial direction and the direction of increase of the...

exactly where i was caught off-guard; i didn't realize that while charge is a dimension-less particle, current actually has one dimension, so while surface density will be defined in terms of area for a charge, it will be defined in terms of length for a current! thanks!

my bad, i realized that i searched for 'surface current density' on google and the first result was that of wikipedia defining 'current density' and i mistook that definition for 'surface current density'...

this will serve as an perfect aid to memory ! thanks!

the main problem that is arising here is that I've studied, in electrostatics, that surface charge density is charge per unit area and I'm wondering if that could be extended to electromagnetism and said that surface current density is current per unit area?

Okay, so in Griffith's introduction to electrodynamics, Griffith clearly defines surface current density as follows: "when charge flows over a surface, we describe it by the surface current density, K. Consider a 'ribbon' of infinitesimal width dL running parallel to the current flow. If the...

hey guys, I'm a new member here. heard of this site a few days back and well, after surfing for some time i found it pretty interesting! i'm a mechanical engineer (#mechie4life :D ) from India.. don't know what else to post so thanks! looking forward to getting doubts clarified and helping...