Electrostatic Field energy problem set.

Name ______

Period ______

Date ______

For the following problems solve for the amount of Electrostatic field energy each set of charges.

1. q1 = 5.0 C q2 = 5.0 C r = 10cm 2. q1 = -5.0 C q2 = 5.0 C r = 20cm

3. q1 = -7.5 C q2 = -5.0 C r = 5 cm 4. q1 = -2.5 C q2 = 5.0 C r = 20cm

For the following problems solve for the amount of Electrostatic potential field energy each charge.

1. q1 = 5.0 C r = 10cm 2. q1 = -5.0 C r = 20cm 3. q1 = 2.5 C r = 40 cm

For the following problems solve for the voltage for each charge.

1. q1 = 5.0 C r1 = 0cm r2 = 10cm 2. q1 = -5.0 C r1 = 10 cm r2 = 20cm

3. q1 = -7.5 C r1 = 10cm r2 = 5 cm 4. q1 = -2.5 C r1 = 10 cm r2 = 20cm

Determine whether work has to done by you or the field to move an electron from r1 to r2.

1. q1 = 5.0 C r1 = 5cm r2 = 10cm 2. q1 = -5.0 C r1 = 10 cm r2 = 20cm

3. q1 = -7.5 C r1 = 10cm r2 = 5 cm 4. q1 = -2.5 C r1 = 10 cm r2 = 20cm

Solve the following word problems.

1. One of the key components to a mass spectrometer is a voltage called “ the accelerating voltage. Here is how it works; a substance is vaporized, in the process of vaporizing all of the electrons are striped off. The gas is then moved into the accelerating voltage. The accelerating voltage is basically two plates one positive and one negative, which push the substance to one of the plates, where there is a hole where the substance will pass through.

a) Determine what plate is positive and which plate is negative if the arrow is the direction the substance is to move

b) The voltage between the two plates is 10V and vaporized carbon is placed between the plates, calculate the energy each particle have in the voltage.

c) The electrostatic energy is transformed in to kinetic energy (1/2 mv^2) what is the difference in the kinematics energy of carbon 12 and carbon 14?

d) What is the difference in the velocities of carbon 12 and carbon 14?

2. We need to construct a box of charge, and like all boxes of charge, it needs to be done one at a time, starting with the corners. The instruction are written in a different language but the diagram has labeled each corner A,B,C and D. You presume the box is assembled in alphabetical order. Charge A is 10 C, charge B is 20 C, charge C is -10 C, and charge D is 10 C.

a) How much work must be done to bring the first charge?

b) How much work must be done to bring in the third charge?

c) How much work must be done to bring in the last charge?

d) What is potential at the center of the square?