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.
e
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A conductor is distinguished from an insulator with the same number of atoms by the number of:
A) nearly free atoms B) electrons C) nearly free electrons D) protons E) molecules
The intricate patterns visible in an X-ray image of the Sun generally show
A) helioseismological fluctuations. B) a bubbling pattern on the photosphere. C) extremely hot plasma flowing along magnetic field lines. D) structure within sunspots.
A flatbed truck is carrying an 800-kg load of timber that is not tied down. The maximum friction force between the truck bed and the load is 2400 N. What is the greatest acceleration that the truck can have without losing its load?
What will be an ideal response?
A concave mirror has a focal length of 20 cm. What is the magnification if the object's distance is 100 cm?
a. 1/2 b. 1/4 c. ?2 d. 4 e. ?1/4