The nucleus of a 125 Xe atom (an isotope of the element xenon with mass of 125 u) is 6.0 fm in diameter [1 fm = 1 femtometer = 1 x 10-15 m], has 54 protons, and charge q = +54e. (a) What is the electric force on a proton 2.0 fm from the surface of the nucleus? (b) What is the proton's acceleration? HINT: Treat the nucleus as a sphere with a point charge at its center. Remember that a proton has a positive charge of 1.6 x 10-19 C and that the mass of a proton is approximately 1.67 x 10.27 kg. A sketch may also turn out to be useful.

In 1911, Ernest Rutherford and his assistants Geiger and Marsden conducted an experiment in which they scattered alpha particles (nuclei of helium atoms) from thin sheets of gold. An alpha particle, having charge +2e and mass 6.64 x 10-27 kg, is a product of certain radioactive decays. The results of the experiment led Rutherford to the idea that most of an atom's mass is in a very small nucleus, with electrons in orbit around it. Assume an alpha particle, initially very far from a stationary gold nucleus, is fired with a velocity of 2.98 × 107 m/s directly toward the nucleus (charge +79e). What is the smallest distance between the alpha particle and the nucleus before the alpha particle reverses direction? Assume the gold nucleus remains stationary. fm

(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 8.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) Imagine adding electrons to the pin until the negative charge has the very large value 3.00 mC. How many electrons are added for every 109 electrons already present?

(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 13.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) Imagine adding electrons to the pin until the negative charge has the very large value 1.00 mC. How many electrons are added for every 109 electrons already present?

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…

The electric field at point P is 9.3 x 1020 N/C @ 343°. What is the angle of the force experienced by a proton if it is placed at point P. Express your answer in degrees.

Given the magnitude of an electric field directed downward equals 100 N/C. If two point charges (qA and qB), qA=2000 V and qB= 1000V. The charges are located 10 cm apart. What is the field strength at qA?

An electric dipole consists of a particle with a charge of -2 x 10–6 C at the origin and a particle with a charge of +2 x 10–6 C on the y-axis at y = -4 x 10–3 m. Its dipole moment is Select answer from the options below                       0 C ·  m, because the net charge is 0 .   8.0 x 10–9 C ·  m, in the negative x-direction. 8.0 x 10–9 C ·  m, in the negative y-direction. 8.0 x 10–9 C ·  m, in the positive x-direction. 8.0 x 10–9 C ·  m, in the positive y-direction.

A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of 7420 N/C. The mass of the water drop is 4.78 × 10-9 kg. How many excess electrons or protons reside on the drop

Two chloride ions and two sodium ions are in water, the “effective charge” on the chloride ions (Cl−) is −2.00 × 10−21 C and that of the sodium ions (Na+) is +2.00 × 10−21 C. (The effective charge is a way to account for the partial shielding due to nearby water molecules.) Assume that all four ions are coplanar.             where a = 0.280 nm, b = 0.760 nm, and c = 0.460 nm.         What is the direction of electric force on the chloride ion in the lower right-hand corner in the diagram? Enter the angle in degrees where positive indicates above the negative x-axis and negative indicates below the positive x-axis.   °         Prev