a) A small electrically heated element of surface area 33.2 cm² is encloscd in a large vessel. Whensteady state is reached, the following observations are recordedVoltage across heating element, 7.5VElectric current through the element, 0.68ASurface temperature of the clement, 90°CThe temperature of the vessel may be taken as equal to the surrounding air temperature 30 C. Theemissivity of the surface of the element may be taken as 0.8.Make a sketch of the set-upi)ii)Calculate the heat exchange by radiation between the element and the vesselCalculate the heat transfer from the element by natural convection and the film heattransfer coefficient.

Answered: Image /qna-images/answer/fa4ea719-fcd7-41de-b5b5-7ab04ca1cacd.jpg

Answered: a) A small electrically heated element…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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In a concentric spherical electrode system, the outer radius is 7 cm and the voltage is 100 kV and is constant. Find the maximum electric field for the value 3.5 of the geometric characteristic. Does puncture occur? What type is it. (Ed=65 kV/cm)
In a material medium with relative dielectric constant LaTeX: \ varepsilon_r = 3 & varepsilon; r = 3, LaTeX: 5 \ mu C5μC load LaTeX: R = 2mR = 2m radius is uniformly distributed over the sphere volume. Accordingly, which of the following is the expression of electric field outside the sphere.
3.(Part I) A 50 V voltage generator at 20 MHz is connected to the plates of an air dielectric parallel-plate capacitor with a plate area of 2.8 cm^2 and a separation distance of 0.2 mm. Find the maximum value of displacement current density and displacement current. (Part II) A dielectric material with permeability that of free space, permittivity = 9xpermittivity of free space, conductivity = 4 S/m, is placed between the plates of a parallel-plate capacitor. Calculate the frequency at which the conduction and displacement currents are equal.
In a dielectric material medium with relative dielectric constant Er = 3, the 5 MicroC Load is uniformly distributed over the sphere of radius R = 1. So what is the electric field inside the sphere 1 2 3 4 5 6 7 8 9 10 Sonraki
Example 2.24) In the two-layer uniformly varying field electrode system separated by the X=0 plane, the amplitude of the electric field vector in the first layer is 80kV/cm and the angle it makes with the perpendicular component is 〖20〗^0. Since the relative electric constants of the layers are 4 and 2, respectively, calculate the tangential component of the electric field in the second layer.
Boundary Conditions A dielectric sphere ε1= 2 εo is buried in a medium with ε2= 6 εo. Given thatE2= 10 sin θ ar + 5 cos θ aθ in the medium, calculate. E1 and D1 in the dielectric sphere.
A 5C point charge is placed 5m above a perfect conductor surface in xy plane extending to infinity in both dimensions find the total electric field everywhere.
A coaxial cable has a 10 – mm diameter inside conductor and a metallic sheath with an inside diameter of 20 mm. if the insulating medium has a dielectric constant, k = 2, and a permittivity of 1.113 x 10-10 . What is the capacitance between the conductor and the shield per km? a. 0.1605 uF /kmb. 0.8036 uF /kmc. 0.0803 uF /kmd. 0.403 uF/km
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A point charge of -3.00 micro Coulomb is located in the center of a spherical cavity of radius 6.50 cm that, in turn, is at the center of an insulating charged solid sphere. The charge density in the solid is 7.35 x 10-4 C/m3. Calculate the electric field (in N/C) inside the solid at a distance of 9.50 cm from the center of the cavity. (Don't express your answers in scientific notation)
Find the relative permittivity of the dielectric material present in a parallel-plate capacitor if the surface area of the conducting plates is 0.25 square meters, the separation d between them is 0.2 mm, and the potential difference between the plates is 12 V given that the capacitor stores 2 microjoules of energy
Calculate the wavelength for an electron in the first orbit in the hydrogen atom, and the wavelength for an electron having a velocity of 1200km/s then compare the results

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