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suzukits
Joined: 12 Feb 2012 Posts: 1 Location: Norway

Posted: Sun Feb 12, 2012 6:15 pm Post subject: electrostatics help 


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

Posted: Sun Feb 12, 2012 11:02 pm Post subject: 


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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