Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

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Charge :

Qa=18nC

Qb=-27nC

Qc=?

Distance:

Dab=60 * 10^-2 m

Dac=?

Dbc=?

Fnet=Fbc+Fca

F=k*Q1*Q2/d2

Fbc=-Fca

Qb/Dbc2=-Qa/Dca2

If c is located to right of 'b' then Dbc=x and Dca=(.6+x)m

-27 * 10^-9/x2 = -18 * 10^-9/(.6+x)2

3/2 =x2/(.6+x)2

3(.6+x)2=2x2

3(.36 + 1.2x + x2)=2x2

x2 + 3.6x + 1.08 = 0

To solve quadratic equation:

x= (-b+sqrt(b^2 -4ac))/2a (or) (-b-sqrt(b^2 -4ac))/2a

a=1

b=3.6

c=1.08

-3.6+sqrt([3.6]2 -4*[1]*[1.08])/2(1)=-3.6+2

-3.6-sqrt([3.6]2 -4*[1]*[1.08])/2(1)=-3.6-2

sqrt(12.96 -8.64)=sqrt(4.32)=2.07846

x = -0.7608 m

x = -2.83923 m

If c is located to left of 'a' then Dbc=(.6+x) m and Dca=x m

-27 * 10^-9/(.6+x)2 = -18 * 10^-9/x2

3/2=(.6+x)2/x2

2(.36+1.2x+x2)=3x2

-x2+2.4x+.72=0

To solve quadratic equation:

x= (-b+sqrt(b^2 -4ac))/2a (or) (-b-sqrt(b^2 -4ac))/2a

a=-1

b=2.4

c=.72

-2.4+sqrt([2.4]2-4[-1][.72

-2.4-sqrt([2.4]2-4[-1][.72

sqrt(5.76 + 2.88)=sqrt(8.64)=2.93938

x = -0.26969 m

x = 2.669 m

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