Force between 4.0 and 6.0 µC charges 3.0 m apart

[karush]

$\tiny{18.3.6 Coulomb's Law }$
$\text{A charge of $q_1=4.0 \mu \, C$ is at origin, and charge}$
$\text{$q_2=6.0 \mu \, C$ is on the x-axis at $x=3.0 m$ }$,
$\text{(a) find the force on the charge $q_2$ } $
$\text{(b) find the force on $q_1$ } $
$\text{(c) how would your answer for parts (a) and (b) dffer if $q_2=-6.0 \mu \, C $ }$

ok I plan to take physics 151this fall
so trying to do some expected problems early

 

[topsquark]

$\tiny{18.3.6 Coulomb's Law }$
$\text{A charge of $q_1=4.0 \mu \, C$ is at origin, and charge}$
$\text{$q_2=6.0 \mu \, C$ is on the x-axis at $x=3.0 m$ }$,
$\text{(a) find the force on the charge $q_2$ } $
$\text{(b) find the force on $q_1$ } $
$\text{(c) how would your answer for parts (a) and (b) dffer if $q_2=-6.0 \mu \, C $ }$

ok I plan to take physics 151this fall
so trying to do some expected problems early

Start with Coulomb's law!

[math]F = \dfrac{k q_1 q_2}{r^2}[/math] or [math]F = \dfrac{1}{4 \pi \epsilon _0} \dfrac{q_1 q_2}{r^2}[/math]

(Hint: The force on q1 is the same as the force on q2. Why?)

-Dan