Earth has an electric charge of approximately −5.7×105C distributed relatively uniformly on its surface. The radius of Earth is 6370 km. Determine the magnitude of the electric field at the surface of Earth.

A small object of mass 3.50 g and charge −17.9 μC is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground. What are the magnitude and direction of the electric field? magnitude= Direction east, downward, west, or upward?

A particle of mass m = 1.0 g and charge 2.0 µC is placed in a region of space that has a constant electric field of magnitude 2000 N/C. What is the magnitude of the force exerted on the particle due to the electric field? O 4 x 103 N O 2N O 4N O 1000 N 2000 N O 4000 N 2 x 10° N O 1x 10° N

In this example, we will analyze the motion of an electron that is released in an electric field. The terminals of a 100 V battery are connected to two large, parallel, horizontal plates 1.0 cm apart. The resulting charges on the plates produce an electric field E in the region between the plates that is very nearly uniform and has magnitude E = 3.0×104 N/C. Suppose the lower plate has positive charge, so that the electric field is vertically upward, as shown in (Figure 1). (The thin pink arrows represent the electric field.) If an electron is released from rest at the upper plate, what is its speed just before it reaches the lower plate? How much time is required for it to reach the lower plate? The mass of an electron is mẹ = 9.11 x 10-31 kg. The thin arrows represent the uniform electric field. 1.0 cm 100 V In this example, suppose a proton (mp = 1.67 × 10-27 kg) is released from rest at the positive plate. What is its speed just before it reaches the negative plate? Express your…