point charge? (1 Viewer)

[za]

'discuss qualitatively the elctric field strength due to a point charge, positive and negative charges and oppositely charged parallel plates'


can someone please tell me wat there asking here
do u just say that opposites attract and like charges repel?
how do u talk about point charges?

 

[Xayma]

No things like on a point charge the electric field strength is inversley proportional to the distance.

To oppositely charged parallel plates between the plates the electric field strength is equal.

etc/

 

[angelduck]

Yeah, and electric fiels strength on oppositly charged plates is uniform towards centre, non-uniform round edges

 

[angelduck]

In my summary of it, i got:
- electric field of isolated point charge is indicated by radial straight lines
- evenly spaced and enter/leave surface at right angles
- intensity decreases with distance
- E=kq/d^2 where k=coulomb's constant

 

[za]

thnx
helped me a lot

 

[za]

one more question
wats E=kq/d^2
never seen that one b4

 

[xiao1985]

should be the force experienced by a charged partcile in an electric field with a charge of q... uhm aprt from it should really be:

F = kq1q2/d^2

 

[za]

oh ok fair enough
but it stilll looks weird

 

[mr EaZy]

What is the value of the constant? this is coloumbs law right?

 

[Xayma]

I think the constant is 2.0*10^-7 (amps/square metre I think)

 

[barnzey]

yeh, It looks right

 

[CrashOveride]

havnt seen that before ..its not on the physics formulae sheet either nor can i recall it being in Jacaranda?

 

[Rorix]

hay guys how come k isn't on the datasheet

 

[Xayma]

It is. Last time I checked, of course it isnt called k its called some constant.

 

[Constip8edSkunk]

its called electromagnetic constant on the data sheet if i remember correctly, its derived from the constant factor in the inverse relationship between the distance from a current carrying wire and the strength of the B field from that distance

 

[zeropoint]

To clarify, E = KQ/d^2 describes the electric field strength at a distance d from a point charge Q. Here, K = 1/4*pi*e_0 where e_0 is the permittivity of free space. The numerical value of K is 8.98754 * 10^9.