Author Question: Two spheres are made of conducting material. Sphere 2 has twice the radius of Sphere 1 . What is the ... (Read 100 times)

james0929 · **on:** Jul 28, 2018

Two spheres are made of conducting material. Sphere 2 has twice the radius of Sphere 1 . What is the ratio of the capacitance of Sphere 2 to the capacitance of sphere 1?
a. 1, since all conducting spheres have the same capacitance.
b. 2
c. 4
d. 8
e. A single sphere has no capacitance since a second concentric spherical shell is necessary to make a spherical capacitor. Thus, none of the answers above is correct.

Question 2

Which of the following statements is incorrect?
a. Capacitance is always positive.
b. The symbol for potential difference between the plates of a capacitor is .
c. Water is a polar molecule.
d. When a dielectric is placed in a capacitor it serves to reduce the electric field.
e. Nonpolar molecules cannot be used for dielectric material in a capacitor.