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electrostatics help

 
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suzukits



Joined: 12 Feb 2012
Posts: 1
Location: Norway

PostPosted: Sun Feb 12, 2012 6:15 pm    Post subject: electrostatics help Reply with quote

The following three point charges are placed on the x axis:

5 microcoulombs at x=0 ,

4 microcoulombs at x= - 40cm (B)

6 microcoulombs at x= 80cm.(A)

Find the force on A and B.

I really don't know how to use the formula for this.
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hepcj
Site Admin


Joined: 23 Jun 2007
Posts: 125

PostPosted: Sun Feb 12, 2012 11:02 pm    Post subject: Reply with quote

The electrostatic force on a charged particle is the sum of the forces on individual pairs of charges as given by Coulomb's Law:
Force on A:
F_A = Sum(i = charges 0 and B), q_A q_i/(4pi*epsilon_0* (r_A,i)^2)

Force on B:
F_B = Sum(i = charges 0 and A) q_B q_i/(4pi*epsilon_0 * (r_B,i)^2)


q_A is the charge on particle A , q_B is the charge on particle B and q_i is the charge on particle i.

where r_A,i is the distance between A and particle i,
similarly r_B,i is the distance between B and particle i.
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