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Chapter 28: Magnetic Fields

Fundamentals Of Physics
Pages: 803 - 835

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100 Questions for Chapter 28: Magnetic Fields

  1. In Fig. 28-58, an electron of mass m, charge -e, and low (negligible) speed enters the region between two plates of potential difference V and plate separation d, initially headed directly toward the top plate. A uniform magnetic field of magnitude B is normal to the plane of the figure. Find the minimum value of B, such that the electron will not strike the top plate.

    Found on Page 835
  2. A particle of charge q moves in a circle of radius r with speed v. Treating the circular path as a current loop with an average current, find the maximum torque exerted on the loop by a uniform field of magnitude B.

    Found on Page 835
  3. In a Hall-effect experiment, express the number density of charge carriers in terms of the Hall-effect electric field magnitude E, the current density magnitude J, and the magnetic field magnitude B.

    Found on Page 835
  4. An electron that is moving through a uniform magnetic field has velocity v→=(40km/s)+(35km/s)when it experiences a force F→=−(4.2 fN)+(4.8 fN)due to the magnetic field. If Bx=0, calculate the magnetic field B.

    Found on Page 835
  5. Question: A proton travels through uniform magnetic and electric fields. The magnetic fieldis B→=-2.5i^mT.At one instant the velocity of the proton is v→=2000j^m/s At that instant and in unit-vector notation, what is the net force acting on the proton if the electric field is (a) role="math" localid="1663233256112" 4.00k^V/m, (b) -4.00k^V/mand (c)4.00i^V/m

    Found on Page 829
  6. Figure 28-29 shows 11 paths through a region of uniform magnetic field. One path is a straight line; the rest are half-circles. Table 28-4 gives the masses, charges, and speeds of 11 particles that take these paths through the field in the directions shown. Which path in the figure corresponds to which particle in the table? (The direction of the magnetic field can be determined by means of one of the paths, which is unique.)

    Found on Page 828
  7. In Fig. 28-30, a charged particle enters a uniform magnetic field with speedv0 , moves through a halfcirclein timeT0 , and then leaves the field

    Found on Page 828
  8. At time t1, an electron is sent along the positive direction of an x-axis, through both an electric fieldand a magnetic fieldB→, withE→directed parallel to the y-axis. Figure 28-33 gives the ycomponent Fnet, yof the net force on the electron due to the two fields, as a function of theelectron’s speed vat time t1.The scale of the velocity axis is set byvx=100.0 m/s. The xand zcomponents of the net force are zero at t1. AssumingBx=0

    Found on Page 829
  9. Figure 28-31 gives snapshots for three situations in which a positively charged particle passes through a uniform magnetic field B→. The velocitiesV→of the particle differ in orientation in the three snapshots but not in magnitude. Rank the situations according to (a) the period, (b) the frequency, and (c) the pitch of the particle’s motion, greatest first.

    Found on Page 828
  10. A strip of copper150 m thick and 4.5 mm wide is placed in a uniform magnetic fieldB⇀of magnitude 0.65T, withB⇀ perpendicular to the strip. A currentlocalid="1663949700654" i=23 A is then sent through the strip such that a Hall potential difference Vappears across the width of the strip. Calculate V. (The number of charge carriers per unit volume for copper islocalid="1663949722414" 8.47×1028electro

    Found on Page 829

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