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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.
hepcj

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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