[Homework Home > Coulomb's_Law]

[1]Four charges are oriented in a square as shown. q1 has charge + \mu C , q2 has charge - \mu C , q3 has charge + \mu C , q4 has charge - \mu C . The square has side of length a= m long.

Find the force on q3, the lower left charge.

[2]Two charges are separated by a distance of r= m . One charge has a charge of q1= \mu C , and the other charge has q2= \mu C . What is the force of one charge on the other.

[3]Three charges, q1, q2, and Q are on an axis, like this:

q1= \mu C , q2= \mu C , and Q= \mu C . This distance between q1 and q2 is a= m . Where should Q be placed at some point between q1 and q2, to be in equilibrium (e.g. so it won't move?)

[4]Two small conducting balls, each with mass m= kg are tied to the ends of non-conducting strings. The strings each have a length of L= m . The balls are then each given the same amount of charge, Q= \mu C . Due to Coulomb's law, the balls repel each other, and the system will sit with the balls separated as shown here:

By what distance will the balls be separated (find x)?

[5]Three charges are arranged in a triangle, as shown here

q1 is + \mu C , q2 is + \mu C ,and q3 is - \mu C . The triangle is equilateral, and each side has a length of a= m . What is the force on q1?

[6]Three charges are oriented as shown here

q1=- \mu C , q2=+ \mu C , and q3=- \mu C . The distance between q1 and q3 is r2= m and the distance between q1 and q2 is r1= m . q3 is on a line that make a \theta= degree angle with the y-axis. What is the force on q1?

[7]Two masses (m1 and m2) carrying equal charges, Q, are held at a distance of d= m apart. One of the charges has a mass of m1= kg . They are released. At the instant they are released, m1 has an acceleration of a1= m/s2 and m2 has an acceleration of a2= m/s2 .

  1. What is the mass of m2?
  2. What is Q, the charge on either mass?

[8]Three charges are arranged as shown here.

q1=- \mu C , q2=+ \mu C , and q3=- \mu C . q1 is a distance a= m from q3 and q2 is a distance b= m from q3. What is the force on q3?

[9]Two charges, q1 and q2 have a sum of \mu C . When they are m apart, a repulsive force of N exists between them. What are q1 and q2?

[10]How many electrons are in - C of charge?

[11]Two small metal balls are r= m apart. They repel each other with a force of F= N . What is Q on each ball?