Question

In the figure Q =4.6 nC and all other quantities are exact. What is the magnitude of the force on the charge Q?

Answer 1

do u know coulombs law?

Answer 2

and the superposition principle?

Answer 3

i know coulombs law

Answer 4

fine....then do u know that Force on any charge at any point in space is electric field at that point times the charge u want to keep.

Answer 5

k, then find the electric field at the vertex(where Q is kept) ,, due to the other charges

Answer 6

get it?

Answer 7

well I'm working on it but I'm confused:S

Answer 8

ok.....first find electric field at the point due to charge on the left end alone....

Answer 9

K Q/ r^2

Answer 10

i got 162.286x10^-5 for the final asnwer ????:S

Answer 11

N for the unit.s

Answer 12

wait fora moment...lemme calculate

Answer 13

ok .s

Answer 14

i think its 1.434096 X 10^-3

Answer 15

what did u do ? method?

Answer 16

its only this....horizontal components of the fields(forces) cancel out .....vertical components add up....to find the vertical components u need geometry....Fcos(theta),,,,where theta is the angle between the electric field and the vertical

Answer 17

well i found Force by each charge then found F(net)

Answer 18

no thats not possible.......u have forgotten that forces are indeed vectors.....and vectors dont add up by normal method a+b.....u must apply vector algebra

Answer 19

ur method is possible only if both the forces are in the same direction

Answer 20

but they are not!

Answer 21

get it?

Answer 22

yes thnk u.d