An African fish called the aba has a charge q = +1.2 × 10-² C at its head and an equal magnitude negative charge -q at its tail, as shown in (Figure 1). The fish and position A are both underwater. Assume the charges to be point-like. Figure 0.16 m Α• (+) < 1 of 1 0.12 m >

A uniform electric field exists in the region between two oppositely charged plane parallel plates. An electron is released from rest at the surface of the negatively charged plate and strikes the surface of the opposite plate, 3.40 cm distant from the first, in a time interval of 1.90×10-8 s Part A Part B Find the magnitude of this electric field. Find the speed of the electron when it strikes the second plate. Express your answer in newtons per coulomb. Express your answer in meters per second. να ΑΣφ 5 ? | να ΑΣφ ? E = N/C m/s

A +7 nC charge is located 3.2 meters to the right of a +6 nC charge. Determine the magnitude of the electric field at the midpoint of the two charges. Express your answer as a positive number in N/C.

Find the electric field at P in the figure shown below. (Take r = 1.2 m and ? = 39°. Measure the angle counterclockwise from the positive x-axis.) Find magnitude and direction.

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Assume that a negative charge is placed on the top plate of a capacitor.  A positive charge is placed on the bottom plate.  What is the magnitude of the electric field E between the plates?

What are the magnitude and direction of the acceleration of a proton at a point where the electric field has magnitude of 150 N/C and is directed toward West?

In a typical television or in an older computer picture tube (CRT), the electrons that strike the screen to form an image are accelerated between two charged plates that have a potential difference of 2.5×104 V. The plates are separated by a distance of 1.3 cm. Assuming that there is a uniform electric field between the plates, calculate the strength of the field.

Liquid water has a large dielectric constant of ɛ, = 80. Suppose that a single sodium ion (Na+, carrying a positive charge of +1e) is held in the middle of a beaker of pure water. Compared to the volume of the sodium ion, the volume of the water can be effectively treated as infinite. a) Write down the electric displacement at r distance away from the sodium ion. b) Write down the electric field at r distance away from the sodium ion. c) Write down the electrostatic force that the sodium ion acts on a water molecule that is 2nm away from the ion and oriented with its dipole moment radially away from the ion. d) Calculate the polarization at a distance r = 2nm away from the sodium ion. e) The dipole moment of a water molecule is 6.17 x 10-30C · m. Estimate how much fraction of the water molecules that are at 2nm away from the sodium ion are reoriented by the sodium ion. (Assume that there are only two possible states for these water molecules: either randomly oriented and showing zero…

The electron gun in a 1990’s style television tube uses a uniform electric field to accelerate electrons from rest to 5.0 × 107 m/s in a distance of 1.2 cm.  What is the electric field strength?