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Electrostatic forces/fields

  • Thread starter Nitrate
  • Start date
  • #1
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Homework Statement



An unknown charge and a charge of 60 nC are 2.0m apart. The electric field strength is zero at a point 0.80m from the unknown charge on a line connecting the two charges. Find the magnitutde of the unknown charge.

Homework Equations


q=F/E
F=kq1q1/r^2
E=kq/r^2

Coulomb constant: 8.99 x10^9


The Attempt at a Solution


I tried making an equation with the info given, but it doesn't seem like it's gonna help me:
0=(8.99x10^9)(x)/(0.8)^2

i think i just need a push in the right direction
 

Answers and Replies

  • #2
75
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anyone?
 
  • #3
390
1
What is the equation of an electric field with 2 charges present?
 
  • #4
75
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What is the equation of an electric field with 2 charges present?
uhh?
force?
 
  • #5
390
1
If the system has 2 charges how do you find the force on a third charge at a point? :)
 

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