PHSI191 Study Guide - Final Guide: Compton Scattering, Absorbed Dose, Thin Lens

if the charge and mass are tripled for two identical chargesmaintained at a constant separation, the electric and gravitationalforces between them will be changed by what factor?

A charged insulator and an uncharged metal object near each other

(a) exert no electric force on each other.

(b) repel each other electrically.

(c) attract each other electrically.

(d) attract or repel, depending on whether the charge is positive or negative.

Here is the problem:

In a uniform electric field near the surface of the earth, aparticle having a charge of -2.0X10^-9 C is acted on by a downwardelectric force of 3.0 X 10^-6 N.

a) what is the magnitude of the electric field?
b) What is the magnitude and direction of the electric forceexerted on a proton placed in this field?

c) What is the gravitational force on the proton?
d) What is the ration of the electric force to the gravitationalforce in this case?