Electric Field of a Sphere

Which device did Charles Coulomb utilize in the 1700s to conduct the initial measurements of electric field strength?

• A voltmeter

• A torsion balance

• An ammeter

• A galvanometer

What happens to the electric field strength around a charged sphere as the magnitude of the charge on the sphere increases?

• It decreases

• It remains constant

• It increases

• It becomes zero

If the distance from a point charge is doubled, how does the electric field strength at that point change?

• It doubles

• It is halved

• It is quartered

• It quadruples

In the formula for electric field strength, E = 1/(4πε₀) * |Q|/r², what does the term 4πr² represent?

• The volume of the sphere

• The circumference of the sphere

• The surface area of the sphere

• The diameter of the sphere