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An outside force, Fo, brings two small metal spheres, A and B, at rest from a long distance away to a point where they are 0.9 meters apart. They are then connected by a non-conducting string of negligible mass. The spheres have mass mA = 5.2 g and mB = 10.4 g and both have equal positive charges of 5 μC. (You may assume the length of the string is much greater than the radii of the spheres.) 1)What was the total work done by the outside force to bring the spheres to the point described? 2)What was the total work done by the electric field when the two sphere were brought together as described? 3)What is the potential energy of the two sphere system after they have been brought together as described

An outside force, Fo, brings two small metal spheres, A and B, at rest from a long distance away to a point where they are 0.9 meters apart. They are then connected by a non-conducting string of negligible mass. The spheres have mass mA = 5.2 g and mB = 10.4 g and both have equal positive charges of 5 μC. (You may assume the length of the string is much greater than the radii of the spheres.) 1)What was the total work done by the outside force to bring the spheres to the point described? 2)What was the total work done by the electric field when the two sphere were brought together as described? 3)What is the potential energy of the two sphere system after they have been brought together as described

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An outside force, Fo, brings two small metal spheres, A and B, at rest from a long distance away to a point where they are 0.9 meters apart. They are then connected by a non-conducting string of negligible mass. The spheres have mass mA = 5.2 g and mB = 10.4 g and both have equal positive charges of 5 μC. (You may assume the length of the string is much greater than the radii of the spheres.)

1)What was the total work done by the outside force to bring the spheres to the point described?

2)What was the total work done by the electric field when the two sphere were brought together as described?

3)What is the potential energy of the two sphere system after they have been brought together as described? (You may assume the spheres had zero potential energy when they were a long distance apart.)

4)Suppose you cut the string. At that instant, what is the magnitude of the acceleration of sphere A?

5)After a very long time, what is the magnitude of the velocity of sphere A?
Expert Solution
Step 1

Part (1)

Given:

  • The distance between two spheres is r=0.9 m.
  • The mass of first sphere is mA=5.2 g.
  • The mass of second sphere is mB=10.4 g.
  • The charge on the sphere is q=5 μC.

The formula to calculate the work done by outside force is,

W=q24πε0r

Here, W is the work done by outside force, q is the charge on sphere, ε0 is the permittivity of free space and r is the distance between two spheres.

Substitute the known values in the formula to calculate the work done by outside force.

W=5 μC210-6 C1 μC243.148.85×10-12 C2/N·m20.9 m1 J1 N·m=0.25 J

Thus, the work done by outside force on the sphere is 0.25 J.

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