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A uniform electric field points vertically downward. A point object of mass 0.2 kg and charge −0.2 C is accelerating vertically upward with an acceleration of 20 m/s². What is the magnitude of the electric field (in N/C)?

An unknown charge Q is located at the origin. Two points, A and B, are shown in the x-y plane. The electric potential at point A is 200 V. What is the electric potential at point B = (0 m, 3 m) (in V)? Assume the electric potential at infinity is zero. [Hint: you do not need to find Q value.]

A point charge A has a charge of +3 × 10-8 C. The (x, y) coordinates of the charge and a point labeled P are shown in the figure, with coordinates given in meters. What is the magnitude of the electric field due to charge A at point P (in N/C)?

Three point-charges are fixed on a horizontal line, as shown in the figure. The separations between the charges are labeled. The charges are QA = + 2 × 10-4 C, QB = – 1 × 10-4 C, QC = + 1 × 10-4 C. Determine the magnitude of the net electric force on charge C (in N).

A spherical conductor with a radius of 0.5 m carries a total charge of 5 × 10-6 C. A point charge of 2 × 10-6  C is placed at its center. What is the magnitude of the electric field at point A that is located at r = 0.4 m from the center of the sphere (in N/C)? 

Federalism describes a system of government where all power resides with the federal government.

Land is a good example of an excludable good.

Which level of scrutiny typically applies to content-based regulations of speech?

In Tinker, the U.S. Supreme Court ruled that the high school in question could not ban students from wearing armbands to protest the Vietnam War. 

Streets, sidewalks, and parks are good examples of _________.