Awhite dwarf star has a density of about 1.0 x 10^9 kg/m^3. if the earth were to suddenly become as dense as a white dwarf star, what would its radius be? the radius of the earth is actually about 6400 km, and its mass is about 6.0 x 10^24 kg.

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.

The protons in a nucleus are approximately 2 ✕ 10^−15 m apart. consider the case where the protons are a distance d = 1.93 ✕ 10^−15 m apart. calculate the magnitude of the electric force (in n) between two protons at this distance.

The law of reflection states that the angle of reflection is equal to the angle of