Write down an expression for the magnetic electromotive force E generated in a straight conductor of length l moving with velocity v in the magnetic field B. Please use "*" for products (e.g. B*A), "/" for ratios (e.g. B/A) and the usual "+" and "-" signs as appropriate. Please use the "Display response" button to check you entered the answer you expect. E= Display response

Write down an expression for the magnetic electromotive force E generated in a straight conductor of length l moving with velocity v in the magnetic field B. Please use "" for products (e.g. BA), "/" for ratios (e.g. B/A) and the usual "+" and "-" signs as appropriate. Please use the "Display response" button to check you entered the answer you expect. E= Display response

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter11: Magnetic Forces And Fields

Section: Chapter Questions

Problem 66AP: At a particular instant an electron is traveling west to east with a kinetic energy of 10 keV....

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Unreasonable results Frustrated by the small Hall voltage obtained in blood flow measurements, a medical physicist decides to increase the applied magnetic field strength to get a 0.500-V output for blood moving at 30.0 cm/s in a 1.50-cm-diameter vessel. (a) What magnetic field strength is needed? (b) What is unreasonable about this result? (C) Which premise is responsible?
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Consider the axial magnetic field Bv=0IR2/2(y2+R2)3/2 of the circular current loop shown below. (a) Evaluate aaBydy Also show that limaaaBydy=0I (b) Can you deduce this limit without evaluating the integral? (Hint: See the accompanying figure.)
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Consider a uniform magnetic field of magnitude 0.2 T which is directed along the direction of the positive x axis. A positron, which was accelerated by a potential difference of 1 kV, enters this region of the magnetic field with a velocity v which forms an angle of 85 with the x axis. For this case in which the path that the positron describes is helical, as shown in Figure 1, determine:a) The radius r of the helical path.b) The pitch p of the helical path.
To solve problems, you will need to know the formula and orientation of the magnetic field with respect to the current. The formula, B=u0I/2piR, describes the magnetic field B at a distance R from a straight wire carrying current I. u0= 4π*10-7 N/A2 and is called the permeability of free space. Magnetic field is in the units of Tesla (T) and has direction. The field lines "curl" around the wire on a plane perpendicular to the wire as shown below. The direction of this magnetic field "curl" is in the direction of [ans1] 29.3.3 demo.JPG 29.3.3a.png Group of answer choices your curled fingers when your right thumb points along the current direction the plane of the wire that your fingers point to your thumb when your fingers of either hand are curled around the wire the opposing induced field produced by the current
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