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# Charge

### Matlab function of electric field by multiple point charges

See attachment for full description Computing the electric field due to multiple point charges obeys Write a MATLAB function get_efield_points that accepts the charge magnitudes {q1,q2,...qn}, the desired location of the electric field intensity, and the Cartesian coordinate vectors for each point charge in the system. Th

### Electron potential of spherical conductor

Find the electron potential inside and outside of a spherical conductor of radius R = 15 cm carrying a charge Q = 10^-9 C. Evaluate your results for f = 5 cm and r = 20 cm, assuming V = 0 at infinity. Sketch the potential as a function of r. What is the capacitance of the conducting sphere?

### Potential Difference for Protons

(a) Find the potential at a distance of 1.00 cm from a proton. (b) What is the potential difference between two points that are 1.00 cm and 2.00 cm from a proton. Repeat parts (a) and (b) for an electron.

### Capacitance Example Problems

What is the capacitance of two rectangular plates, length 5 cm and width 3 cm, and separation distance of 0.03 mm? What potential will exist across the capacitor if the charge on the capacitor is 8.85 nC? How many excess electrons will be on the negative plate? After the number of excess electrons are found, what ene

### Electric field of a charge inside hollow conducting sphere

(See attached file for full problem description) A hollow grounded conducting sphere of radius a contains a point charge Q at the radius b as shown in the figure (see attachment) a) Show that the field inside the sphere is the same as if there were no sphere and, instead, a charge Q' = -(a/b)Q at D = (a/b)a. You can prov

### Electrical charge

A small charged sphere of mass 0.200 g is suspended by a string in an electric field of 500 N/C. The string makes an angle of 30 degrees with respect to the vertical. What is the charge on the sphere? (Sum of F = 0)

### An electron is fired at a given speed, at a given angle between two parallel conducting plates at specified potential difference. To determine how close the electron will get to the bottom plate, and where the electron will strike the top plate.

An electron is fired at a speed of vo= 5.6x10^6m/s and at an angle of -45 degrees between two parallel conducting plates that are D=2.0mm apart. If the potential difference between the plates is V= 100V, determine: a) How close "d" the electron will get to the bottom plate, and b) Where the electron will strike the top plate

### Gauss' law-Electric field due to a charged hollow spherical shell

A hollow spherical shell carries charge density p = k / r^2, in the region a<=r<=b. Find the electric field in i) the region a< r< b. ii) r> b ---------------------------------------------------------------------------------------- I actually know how to find the E-Field, I'm having trouble with finding the enclosed charge.

### Electric Potential Difference Magnitude and Sign

Location A is 3.00 m to the right of a point charge q. Location B lies on the same line and is 4.00 m to the right of the charge. The potential difference between the two locations is Vb-Va= 45.0 V. What is the magnitude and sign of the charge?

### Colomb's Law in a vacuum of two particles

In a vacuum, two particles have charges of q1 and q2, where q1=+3.5 microcolombs. They are separated by a distance of 0.26 m, and particle 1 experiences an attractive force of 3.4 N. What is the magnitude and sign of q2?

### metallic and electrically neutral

Object A is metallic and electrically neutral. It is charged by induction so that it acquires a charge of -3.0 x 10^-6 C. Object B is identical to object A and is also electrically neutral. It is charged by induction so that it acquires a charge of +3.0 x 10^-6 C. What is the difference in mass between the charged objects an

### Physics Questions (Multiple Choice)

Question 1: If there is a force of 5.0 x 10-12 N acting to the left on an electron, the electric field intensity at the location of this electron will be: a. zero. b. 8.0 x 10-31 N/C to the left c. 3.1 x 107 N/C to the left d. 3.1 x 107 N/C to the right e. none of these Question 2: In one mole or 18 grams of

### Economies of Scope/Logistics/Break Even

9. (a) What is the meaning of economies of scope? How do they differ from economies of scale? (b) What do learning curves show? How do they differ from economies of scale? What is the usefulness of learning curves as a managerial tool? What is the reason for rising international trade in inputs and the use of foreign trade in in

### Find the probability that they meet again after N steps.

This is from Reif's Statistical and Thermal Physics: Two drunks start out together at the origin, each having equal probability of making a step to the left or right along the x-axis. Find the probability that they meet again after N steps. It is to be understood that the men make their steps simultaneously. (It may be helpf

### electric field along central axis of uniformly charged ring

Charge is uniformly distributed around a ring of radius R= 2.40 cm and the resulting electric field magnitude E is measured along the ring's central axis ( perpendicular to the plane of the ring). At what distance from the ring's center is E maximum? In this question, I end up with E(total) = (q * z) / 4*Pi * e * (R^2 + z^2)

### Electricity and Magnetism (Ampere's Law)

1. The long, straight wire AB shown in Figure (Please see the attached file) carries a current of 14 A. The rectangular loop whose long edges are parallel to the wire carries a current of 5 A. Find the magnitude and direction of the net force exerted on the loop by the magnetic field of the wire. 2. A long straight solid cyli

### Force between a point charge and conducting sphere

Using method of images, find the force of attraction between an external point charge +Q and a conducting sphere of potential V_0. Take the charge to be a distance D from the center of the sphere. What value of V_0 makes the force equal 0?

### Charge density induced on the surface of grounded plane

Consider a point charge +q at a distance d above an infinite grounded conducting plane. (a) Determine the charge density induced on the surface, then integrate to find the total surface charge. (b) Find the force that the point charge exerts on the conductor by considering the force on the induced surface charge densi

### Find the direction of the electric field.

3. Suppose two charges, equal in size but opposite in sign, are arranged as shown. Draw arrows representing the direction of the electric field at points A, B, and C. At which of these points is the magnitude of the electric field the largest? 4. Four charges of equal magnitude are placed at the corners of a square, as shown

### Polarization of light

Light is send through the two-sheet polarizing system with unknown orientation of the polarizing axes (see attachment). If the ratio of the emerging intensity to the initial intensity is 0.7, is the light initially polarized or not? Prove your answer. Please state what equations you use (if any).

### Charges and Electric Field Problems

1. Suppose 4 equal positive charges +Q are arranged in a square as shown in the attached diagram. An "x" marks positions A, B, and C. Draw arrows showing the direction of the electric field at each of those points. (If the field strength is zero at a point, say so.) 2. Now we have 4 charges of equal magnitude, but 2 are posi

### Charged concentric conducting spherical shells

Using the attachment, please tell me whether I got the (A) - (E) parts correct. My answers are circled. And please show me how to do the surface charge density in parts (F) - (I). See attached file for full problem description.

### Direction And Magnitude Of Net Electrostatic Force

Please help me with the following problem. Provide step by step calculations. Find the direction and magnitude of the net electrostatic force exerted on the (a) point charge q2 in the attached drawing. Let q = +2.4 micro C and d = 33 cm. (b) Find the direction and magnitude of the net electrostatic force exerted on the poin

### Electric Charge

Find the total electric charge of 1 kg of (a) electrons and (b) protons.

### System of particles

A system of 1525 particles, each of which is either an electron or a proton, has a net charge of -5.456 x 10^-17 C. (a) How many electrons are in this system? (b) What is the mass of this system?

### Electric Charge

When adhesive tape is pulled from a dispenser, the detached tape acquires a positive charge and the remaining tape in the dispenser acquires a negative charge. If the tape pulled from the dispenser has 0.14 micro C of charge per centimeter, what length of the tape must be pulled to transfer 1.8 x 10^13 electrons to the remaing

### PE of particles

Please show all work and show all equations used and diagrams, etc. etc. so I understand completely please. 1) A particle with charge 5.5*10^-8C is fixed at the origin. A particle with a charge -2.3*10-8C charge is moved from X=3.5cm on the x axis to y=3.5cm on the y axis. The change in PE of the two charge system is: 2)

### Point Charges and Electric Fields

Please show all work and diagrams plus equations used to solve problem. Thanks! Two point particles, with charges of q1 and q1 are placed a distance r apart. The electric field is zero at a point P between the particles on the line segment connecting them. We conclude that: (answer C - why) a) q1 and q2 must have the sa

### Electrostatic Force Calculations

Please show all work and diagrams plus equations used to solve problem. Thanks! 1) Two identical conducting spheres A and B carry equal charge. They are separated by a distance much larger than their diameters. A third identical conducting sphere C is uncharged. SPhere C is first touched to A, then to B, and finally remov

### How to Find Direction and Magnitude Net Electrostatic Force

Please give step by step solutions without skipping details to solve and give the answers please! QUESTION GIVEN: 1) In the figure, a central particle of charge -q is surrounded by two circular rings of charged particles. What are the magnitude and direction of the net electrostatic force on the central particle due to the