Recent content by Lucky7

Anyone?

How do I write it in x,y? And why in 3D, I should find the points in 2D not 3D. Any hint to (b)?

Homework Statement Let us have a square ABCD (D is in the topleft corner) of size 1 m. Let us have 3 point charges situated in points B, C and D. The charges are following QB=2C, QC=-1C and QD=5C. The task is to find (a) the points/plane where the electric potential is zero and (b) two points...

The attempt at a solution In the wire there should be electrical intensity E = 0. From the Gauss Law for cylindric symmetry the electric intensity E1 between the wire and the first cylinder should be E1=ta/(2pi*r), where 0.2< r< 3 thus E1(R)=ta/(2pi*R). Analogically for E2 = (ta+tb)/(2pi*r)...

Homework Statement We have a charged straight wire with radius ra = 0.2 cm and with charge ta = 3nanoC/m. Around the wire there are two hollow concentric cylinders, so that the wire is in their axis. Let the charge on the first cylinder be of radius rb = 3cm and its charge tb = -1.5nC/m and on...

This is all I know, we should probably make some of our own assumptions, yeah...

Homework Statement We have a chinese lantern (balloon) made of paper, cylinder shaped with the following sizes: base diameter - 45 cm, height - 70 cm. Mass of the balloon is 57 g (21 g from this is mass of "fuel" - the fuel is wax paper!). Fuel is then ignited at the centre of the base, which...