Q 2 A magnetic circuit has the mean length of flux path of 20 cm, and cross sectional area of 1 cm. Relative permeability of its material is 2900. Find the mmf required to produce a flux density of 2 tesla in it. If of 1 mm is introduced in it, find the mmf required for the air an air gap gap as a fraction of the total mmf to maintain the same flux density.

Q 2 A magnetic circuit has the mean length of flux path of 20 cm, and cross sectional area of 1 cm. Relative permeability of its material is 2900. Find the mmf required to produce a flux density of 2 tesla in it. If of 1 mm is introduced in it, find the mmf required for the air an air gap gap as a fraction of the total mmf to maintain the same flux density.

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...

See similar textbooks

Similar questions

Pr1. A metal rod having a mass m and length e has resistance R. The rod hangs from two vertical metallic wires of length l in a uni- form vertical magnetic field B of a horseshoe magnet (see figure). The wires have negligib- le resistance. An AC voltage source is connec- ted between the wires which provides a voltage U(t) = Uo cos wt, where Uo and w are constants. U(t) S m IN a) Show that for small angular displacements p the motion of the rod can be described by the cquation U (t) = aö + Bộ + VP, and express the constants a, 3, y in terms of quantities m, l, B, R and the gravitational ac- celeration g. b) At a certain frequency w = wo the ampli- tude of the oscillations of the rod becomes large and the equation above does not describe the motion anymore. Estimate the frequency wo.
A solenoid similar to the figure below, has a core made of cast steel (refer to the figure on the next slide). It has a cross-sectional area of 4cm2 and a mean length of 20cm. The coil has 100turns, and the coil current is 3.2A. Find the following: d)Permeability, μ e) the relative permeability, μr f) the core reluctance, R and g) the flux, Ø
Draw the magnetization curve of magnetic materials for varying dc supply (0 to Vm), Ac supply, show the magnetic dipoles for each part of the curve.
An electromagnet is used to support a solid piece of steel, as shown in the figure below. A force of 10,000 N is required to support the weight at a distance of x=0.5m. The cross-sectional area of the magnetic core (the fixed part) is 0.01m2. The coil has 1,000 turns. Assume negligible reluctance in steel and negligible fringing in the air gaps. Fixed fe Movable Determine: 1. The current required to lift the weight | 2. The minimum current required to keep the weight from falling for x = 1.0 mm. Assume negligible reluctance in steel and negligible fringing in the air gaps. Assumptions: Negligible reluctance for the steel parts and negligible fringing in the air gaps.
Q1/ A / Discuss B-H curve of a ferro-magnetic material . B / Define the following terms (any three) : (i) MMF (ii ) magnetism. (iii ) Reluctance (v) flux density
If a magnetizing force H of 600 At/m established. Find the permeability magnetizing force. is applied to a magnetic circuit, a flux density B of 1200 × 10-4 Wb/m² is of a material that will produce twice the original flux density for the same
Derive the self-inductance of ideal ac magnetic circuit in terms of the physical parameters of the circuit.
Amagnetic circuit has an average length of 1.4 m and a cross-sectional area of 0.25 m2. Excitation is provided by a 140 -turn, 30-Q, coil. Determine the voltage required to establish a flux density of 1.56 T. The reluctance of the magnetic circuit, when opera ting at this flux density is 768 A-t/Wb.
Explain the difference between magnetic and nonmagnetic materials and give example of each.
With the aid of Figure Q4(a), explain Lenz's Law. Illustrate the direction of the induced voltage generated by the loop. B The applied magnetic field is increasing y Figure Q4(a)
Given a magnetic circuit with a current 2.6A flowing through 205 turns of wire on a core having a reluctance of 125000 At/Wb. Determine the magnetomotive force of the circuit in base units.
Topic Electrical Machines - Magnetic & E... For a coil, each turn faces (2t4 – t³ – 2t) milliwebers of flux. The value of induced EMF in coil for 100 turns coil at 2 sec is, (in Volts).