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# Flux & Flux Density

### Heat transfer Using Reynolds Analogy

A circuit board with a dense distribution of integrated circuits (ICs) and the dimensions of 120mm by 120mm on a side is cooled by a parallel flow of atmospheric air with a velocity of 2 m/s. From wind tunnel tests under the same flow conditions , the average frictional shear stress on the upper surface is determined to be

### Electrostatics: Charge, flux and Field.

The electric field strength 4.10 cm from a very wide charged electrode is 4000 N/C. What is the charge (in nC) on a 2.00-cm- diameter circular segment of the electrode?

### Electric Field Components

An electric field has the components Ex = -5, Ey = 6 and Ez = -6. A unit cube has its corners at (x,y,z)=(0,0,0), (1,0,0), (1,1,0), (0,1,0), (0,0,1), (1,0,1), (1,1,1), and (0,1,1). (All fields are measured in N/C and all distances are in m.) Calculate the electric flux through the cube at the side x=1. Calculate the electric flu

### Flux Analysis

Obtain the most recent financial statement of any company that you would like to research. Please state the name of the company, its business activity along with key financial data (sales, operating profit, net income, assets, liabilities and equity of this company). 2. Obtain the same information for one of company's compe

### Magnetic Circuits

Given the relationship B/H=u H=IN/l and L=N*change in magnetic flux/change in coil current show that the inductance of a coil is: L=N^2/S where S=l/uA

### Electric Field and Equipotential Mapping

Equipotential surface and problems are attached.

### Vector Fields

1 Calculate the divergence and curl of the vector field F(x,y,z) = 2xi+3yj+4zk. 2 Find the potential of the function for the conservative vector field: F(x,y,z) = (y+z)i + (x+z)j + (x+y)k. 3 Use Green's theorem to calculate the work done when a particle is moved along the helix x = cos t, y = sin t, z

### Electric field and bounded charges on dielectric surfaces.

A uniformly charged straight wire of radius a carries linear charge density( lambda). The wire is coated with a linear dielectric material of susceptibility and external radius b. a. Find electric field everywhere b. Find the volume and surface bound charge densities

### electric flux of a hemisphere

Let..... be the closed surface that consists of the hemisphere and its base Let be the electric field defined by . Find the electric flux across . Write the integral over the hemisphere using spherical coordinates, and use the outward pointing normal. Please see the attached file for the fully formatted problems.

### Flux of Vector Field Across a Surface

Let S be the part of the plane which lies in the first octant, oriented upward. Find the flux of the vector field across the surface S. Please see the attached file for the fully formatted problems.

### Diffusion Equation Solution

Diffusion equation. See attached file for full problem description.

### 14 Modern Physics Questions

See attached file for full problem description. 1. A certain string on a piano is tuned to produce middle C (f = 261.63 Hz) by carefully adjusting the tension is the string. For a fixed wavelength, what is the frequency when this tension is doubled? a. 130.08 Hz b. 185.00 Hz c. 370.00 Hz d. 446.63 Hz e. 523.26 Hz 2

### Hail bounces off the roof of the car with a velocity of +15 m/s. Ignoring the weight of the hailstones, what is the force exerted by the hail on the roof.

Hail bounces off the roof of the car with a velocity of +15 m/s. Ignoring the weight of the hailstones, what is the force exerted by the hail on the roof.

### Curls and Divergence of Magnetic Fields

See attached file for full problem description. For scan 0005 and 0006, the hint is scan 0007.

### A loop of wire in a shape of a rectangular of width w and length L and a long, straight wire carrying a current I lie on a tabletop. Determine the magnetic flux through the loop due to the current I.

A loop of wire in a shape of a rectangular of width w and length L and a long, straight wire carrying a current I lie on a tabletop. Determine the magnetic flux through the loop due to the current I. See attached file for full problem description.

### Magnetic Flux and Magentic Field

See attached file for full problem description. 1. Two circular coils of radius R each perpendicular to a common axis. The coil centers are a distance R apart and each coil carries a steady current I in the same direction. Show that magnetic field on the axis at a distance x from the center of one coil is Show that are bot

### Physics questions on oscillations and waves

1. A certain string on a piano is tuned to produce middle C (f = 261.63 Hz) by carefully adjusting the tension is the string. For a fixed wavelength, what is the frequency when this tension is doubled? a. 130.08 Hz b. 185.00 Hz c. 370.00 Hz d. 446.63 Hz e. 523.26 Hz 2. A bell is ringing inside of a sealed glass jar

### Transformer - Flux, Flux Density Etc.

The primary winding of the transformer considered in question has 1000 turns. The iron core has a cross section of 70cm^2, and a mean path length of 150cm for the magnetic flux within it. The permeability of the iron may be assumed to be 0.0040 henrys per metre. (a) Calculate the maximum flux and flux density in the iron core

### To determine the equivalent winding resistance, percentage regulation, efficiency of a single phase transformer.

A single-phase transformer is rated 100kVA, 2200:440 volts. When carrying rated current with the low voltage terminals short-circuited, the input power was 1.14kW, and the applied voltage 93V rms. (a) Determine the equivalent winding resistance and leakage reactance of the transformer referred to the low voltage side. (b)

### Magnetic Circuits: MMF and Reluctance

The magnetic circuit shown in figure below is built up of solid iron cross section, 1x1cm2. Each air gap is 1 mm wide. For this type of air gap, the effective cross-section of the air may be taken as 1.2 x that of iron path to allow for fringing. Two different grades of iron are used. When a coil having 2000 turns is wound on pa

### Transformer Wiring

Please help me draw a picture with a description of the solution with a step-by-step analysis using equations: 1) An enclosed transformer has four wire leads coming from it. How could you determine without taking the transformer apart: a) which wires are paired with which and b) what is the ratio of turns on the two coils? A

### Electric displacement vector

Electric displacement vector. See attached file for full problem description.

### 4 Electrostatics Problems: Field, force, potential, energy

(See attached file for full problem description) --- A small plastic ball of mass 6.39 x 10-3 kg and charge +0.164 C is suspended from an insulating thread and hangs between the plates of a capacitor (see the drawing). The ball is in equilibrium, with the thread making an angle of 30.0° with respect to the vertical. The ar

### Electrostatics: Unequal Charge density on parallel plates

(See attached file for full problem description) --- 1. Consider two infinite parallel plane conducting plates, of finite thickness, with separation d. Suppose a charge density of sigma; is placed on one plate, while the other plate has -2sigma. A) Determine the resulting charge densities on each of the 4 surfaces B) De

### Air speed at nozzle exit

Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m cubed and a speed of 1.20 m/s. The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m cubed. What is the speed of the air when it leaves the nozzle?

### You have a neutron with a kerma of some amount. How do you calculate the fluence?

You have a neutron with a kerma of some amount. How do you calculate the fluence?

### Current in a Loop

If the current in the loop of the attachment were halved, the total flux threading the loop would: 1) Halve 2) Be reduced to 1/4 of the previous value 3) Decrease to 3/4 of its original value 4) Decrease by more than 1/2 but greater than 1/4 its previous value.

### Static Magnetic Field Theory

Q1) What is the flux density of the current loop in the plane of the loop on the attachment? 1) 1.68 x 10^ -5Wb/m^2 2) 2.36 x 10^ -5 Wb/m^2 3) 1.68 x 10^ -4 Wb/m^2 4) 2.36 x 10^ -4 wb/m^2 5) 2.87 x 10 wb/m^2 6) None of the above Q2) What is the value of the total flux threading the loop? 1) 5.92 x 10^ -8wb

### Static Magnetic Field - Flux, direction of flux, equivalent reluctance of the core, permeability of the core material

See the attached files. In the attachment titled "Box Question" are questions for the second attachment, titled "The Box", a diagram.

### Electrostatic flux through a circular region

What is the electrostatic flux of a field of magnitude 6 N/C through a circular region with radius 9.2 meters, if the field makes an angle of 25 degrees with a perpendicular to the plane of the region?