Electricity and Magnetism Answers

describe the electromagnetic spectrum in your own words using wavelength and frequency.

4. Based on Coulomb’s law, when there is a strong attraction force between two particles, which of the following could be said about the magnitude and the sign of the potential energy?

 A. A small positive value

 B. A small negative value

 C. A large negative value

 D. A large positive value

How many excess electrons must be added to a plastic solid sphere that has a diameter of 0.26 m to produce an electric field of 1030 N/C at the edge of the surface? Assuming the charge is uniform, what is the electric field at 10 cm from the center?

a) A plate with positive charge is 0.05 m higher than a plate with negative charge, and the electric field has an intensity of E=5x10⁴N/C. Determine the work performed by the electric field E when a charge of +5x10^-6C moves from the negative plate to the positive plate.

b) Find the electric potential at a point located at 0.05m of a charge of +8x10^-6C. Find the potential energy of a charge of 3x10^-9C that is located at that same point.

a) Two spheres, each with a charge of +3x10^-6C, are separated by 100 mm. Are they attracting each other or rejecting? Determine the force between them. 

b) A charge +4x10^-6C placed at point P within an electric field, experiences a force of F=-8x10^-4N. Determine the intensity of the electric field.