- #1

henrco

- 47

- 2

## Homework Statement

A point charge

*q*1 = 4.40 μC is at the origin and a point charge

*q*2 = 6.00 μC is on the

*x*axis at

*x*= 2.49 m.

i) Find the electric force on charge

*q*2

ii) Find the electric force on charge q1

## Homework Equations

Coulomb's law F = k (q1q2)/d^2

## The Attempt at a Solution

Part i)

Using k = 8.99 x 10^9, q1 = 4.40 x 10^-6, q2 = 6.00 x 10^-6 and d = 2.49m

Plug these values into the equation

F = (8.99 x10^9) x (4.40 x 10^-6) x (6.00 x 10^-6)/ (2.49)^2

F = 3.83 x 10^-2 N

Checked this value a couple of times and seems correct.

Part ii)

Since we are looking for the force from q2 to q1, it is the same magnitude but opposite in direction.

F = -3.83 x 10^-2 N

I'm a little unsure of this, but if feels correct. If I'm wrong, any guidance welcome.