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square coil with current, mr rib a = 2cm is located in the homogeneous magnetic field with induction 0.2 tesla and its perpendicular forms the angle 60 °, with the lines of induction. Knowing that the moment of magnetic forces is 2 × 10-³ N × m to be determined: a) The magnetic moment of the coil and the current in the coil

A loop of wire is bent to have straight and circular arc shaped parts as shown in the figure. A constantcurrent I of 36A flows through the wire in the direction depicted in the figure. If the length R equals13 cm, determine the magnitude and the direction of the magnetic field produced by the loop of wireat point O by using Biot-Savart’s Law (µ0=≈1.26x10-6 T.m/A)

The magnetic field intensity in a magnetic material in the form of a circular rod with magnetic permeability n with its axis in the z direction is azH0(H0 is constant). 1)what's B and M inside the bar? What are the equivalent magnetizing current densities jmv and jm for the magnetized rod?

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.

explain why Two coils are said to be mutually coupled if the magnetic flux Ø emanating from one pass through the other. The mutual inductance between the two coils is given by M=ksquare root of L1xL2

The magnitude of the induced emf in a coil due to the effect of a variable magnetic field on its length is numerically equal to the product of length of the coil and the rate of change of the linkage flux on it.  true / false

Define and sketch uniform and non uniform field, give examples of each.

While the two parallel ends shown in the figure are connected to each other with a metal rod, the other two ends are free. A conductive rod can slide freely on the rails.The speed of the stick is constant.In the figure, there is a magnetic field perpendicular to the plane and in the direction of which the size is 35 tesla.a) Since the distance between the rails is 25cm and the speed of the conductor rod is 55cm / sec, find the emk formed in the abcd frame consisting of the rail and the conductor rod.b) The resistance of the conductive rod is 18 ohms. If the resistance of the rails is neglected, find the current passing through the rod.c) What should be the magnitude of the external force that must be applied to the rod so that it can maintain its movement at a constant speed?d) Calculate the work done by the external force per unit time.e) Show that this work is equal to the heat energy spent on the rod resistance.

السؤال Magnetic field Produced by the presence of electrically charged particles, and gives rise to the electric force. الاجابات True   False

Find the rate of change with time of the magnetic field at a location at which the induced electric field is given by: Eo( (y/yo)^2î + (x/xo)^2ĵ + (z/zo)^2k̂)

A ferromagnetic material has a remanence of 1.5 T and a coercivity of 50,000 A/m.Saturation is achieved at a magnetic field intensity of 200,000 A/m, at which the fluxdensity is 2.5 T. Using these data, sketch the entire hysteresis curve in the rangeH= −200,000 to +200,000 A/m

A ferromagnetic ring has a uniform cross-sectional area of 2000 mm2 and a mean circumference of 1000 mm. A hysteresis loop obtained for the specimen is plotted to scales of 10 mm = 0.1 T and 10 mm = 400A/m and is found to have an area of 104 mm2. Determine the hysteresis loss at a frequency of 80 Hz.

L:26) A permanent magnet that is infinitely long in the direction perpendicular to its height t, is made a cylindrical hole of radius R. Finds the magnetic field in all space when R << t. Hint: Consider the system as the union of the magnet without the hole plus a magnetization cylinder opposite to the magnet.

A magnetic field is now changed such that it has the functional form B = A cos(ωt). Derive an equation for the induced EMF as a function of time, assuming the magnetic field still makes an angle θ to the plane of the coil.

The cross section of a homopolar generator disk is shown . The disk has inner radius ρ1 = 2 cm and outer radius ρ2 = 10 cm and rotates in a uniform magnetic field 15 mWb/m2 at a speed of 60 rad/s. Calculate the induced voltage.

1. An emf of 16V is induced in a coil of inductance 4H. The rate of change of current must be ___. 2. If a permanent magnet has a uniform flux of 14,000 lines between the pole faces, what must its area be to have a flux density of 7,000 gauss, in square inch?

The parallel-plate capacitor shown to the right is discharging so that the electric field between the plates decreases. Answer the questions below and explain your reasoning. The bulk of the credit will come from your explanation. What is the direction of the magnetic field at point P?

A 20.0-cm-long metal rod can move freely on two horizontal, frictionless conducting rails connected to a resistor, R = 15.0 Ω. The magnetic field in the region is directed out of the page, as shown in the figure. The rod is being pulled to the right at a steady speed of v = 0.80 m/s by a constant force, F = 1.20 N. a.) What is the current through the resistor, R = 15.0 Ω b.)What is the direction of the current and the induced magnetic field? (Just give an answer in the table provided) Direction of current Direction of induced magnetic field

a. Find the current I required to establish a fluxφ = 2.4 × 10−4 Wb in the magnetic circuit ofFigure. Here area (throughout) =2 × 10−4 m2, lab = lef = 0.05 m, laf = lbe= 0.02 m, lbc = ldc, and the material is sheet steel. b. Compare the mmf drop across the air gap to thatacross the rest of the magnetic circuit. Discuss yourresults, using the value of μ for each material.

Describe, with the aid of sketches, the effect on acurrent-carrying conductor lying in and at right anglesto a magnetic field.Exercises 46 continuedThe coil of a moving-coil instrument is woundwith 40 turns. The mean width of the coil is 4 cmand the axial length of the magnetic field is 5 cm. If theflux density in the gap is 0.1 T, calculate the torque inN m when the coil is carrying a current of 10 mA

A long rigid wire carries a 3.0 A current flowing in the positive Y-direction in a device. If a constant magnetic field of magnitude 0.20T is directed along the positive X-axis, then suggest the magnetic force per unit length on the wire. If this wire is replaced by another wire of length 50 cm experience a magnetic field of 1.20T. Evaluate the magnetic force acting on it. Compare both results and conclude the observations. If there is no net charge in a current carrying wire, is it possible to experience a magnetic force by it? Explain your observation.