30)
30) A particularly scary roller coaster contains a loop-the-loop in which the car and rider are
completely upside down. If the radius of the loop is 13.2 m, with what minimum speed must the
car traverse the loop so that the rider does not fall out while upside down at the top? Assume the
rider is not strapped to the car.
A) 14.9 m/s
B) 12.5 m/s
10.1 m/s
D) 11.4 m/s

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.