Exam 15: Electric Forces and Fields

Electrons in a particle beam each have a kinetic energy of 4.0 × 10−¹⁷ J.What is the magnitude of the electric field that will stop these electrons in a distance of 0.3 m? (e = 1.6 × 10−¹⁹ C)

A charge Q accumulates on the hollow metallic dome,of radius R,of a Van de Graaff generator.A probe measures the electric field strength at various points outside the sphere surface.By what factor will the electric field value at the 2R distance be changed if the charge value were increased to (5/3)Q?

Electric field is dimensionally equivalent to which of the following?

A thin uncharged conducting spherical shell has a charge q carefully placed at its center through a small hole in the shell.The charge q does not touch the shell.What is the charge on the outer surface of the shell?

Two point charges each have a value of 35.5 mC and are separated by a distance of 4.0 cm.What is the electric field midway between the two charges? (k_e = 8.99 × 10⁹ N·m²/C²)​

At what point is the charge per unit area greatest on the surface of an irregularly shaped conducting solid?

In Millikan's oil drop experiment,if the electric field between the plates was of just the right magnitude,it would exactly balance the weight of the drop.Suppose a tiny spherical oil droplet of radius 1.3 × 10−⁴ cm carries a charge equivalent to one electron.What electric field is required to balance the weight? (The density of oil is 0.85 g/cm³,e = 1.6 × 10−¹⁹ C. )​

Object A has a charge q on it,object B has a charge q on it,and object C has a charge 3q on it.These charges are arranged,one each,at the vertices of an equilateral triangle.Which charge has the greatest magnitude electric force on it?​

An uncharged conductor is supported by an insulating stand.I pass a positively charged rod near the left end of the conductor,but do not touch it.The right end of the conductor will be

If a conductor is in electrostatic equilibrium near an electrical charge: