A person is walking on a flat surface of constant elevation. This person's gravitational potential energy is:

a. decreasing b. increasing c. remaining the same

Which of the following is true of electric fields:

a. the number of electric field lines is larger in locations where the electric field is stronger

b. all of the answers are correct. c. electric field lines point from positive charge to negative charge d. electric fields lines point from higher electric potential to lower electric potential

Near a positive central source charge, the electric field lines ...(1)... and the electric potential ...(2)... .

a. are radially outward; 2: surfaces are a series of concentric spheres

b. are radially inward; 2: surfaces are a series of concentric spheres

c. are radially inward; 2: surface is a single concentric sphere d. are radially outward; 2: surface is a single concentric sphere

When several source charges (or electrodes) are placed in a particular configuration, the electric field at a nearby point is the ....... sum of the electric fields from each of the individual charges (or electrodes).

a. scalar b. vector c. either the scalar or the vector

When several source charges (or electrodes) are placed in a particular configuration, the electric potential at a nearby point is the ....... sum of the electric potentials from each of the individual charges (or electrodes).

a. scalar b. either the scalar or the vector

c. vector