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.
The fibers in silk cloth and in a spider web are made up of the protein fibroin
Conducting system of the heart.
Earth’s Spheres
Earth’s Spheres
Inferior view of distal ends of radius and ulna
Water forms spheres of hydration