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Chapter 22: Electric Fields

Fundamentals Of Physics
Pages: 630 - 658

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96 Questions for Chapter 22: Electric Fields

  1. Figure 22-39 shows an uneven arrangement of electrons (e) and protons (p) on a circular arc of radius r=2.00 cm, with angles,,, and. What are the (a) magnitude and (b) direction (relative to the positive direction of the xaxis) of the net electric field produced at the center of the arc?

    Found on Page 653
  2. In Fig. 22-41, particle 1 of charge q1 = -5.00q and particle 2 of charge q2=+2.00qare fixed to an xaxis. (a) As a multiple of distance L, at what coordinate on the axis is the net electric field of the particles zero? (b)Sketch the net electric field lines between and around the particles.

    Found on Page 653
  3. In Fig. 22-42, the three particles are fixed in place and have charges q1=q2=+e and q3=+2e . Distance, a=6.0 mm. What are the (a) magnitude and (b) direction of the net electric field at point Pdue to the particles?

    Found on Page 654
  4. Figure 22-38ashows two charged particles fixed in place on an x-axis with separation L. The ratio q1/q2 of their charge magnitudes is . Figure 22-38bshows the xcomponentEnet,Xof their net electric field along the x-axis just to the right of particle 2. The x-axis scale is set by xs=30.0cm. (a) At what value ofx>0isEnet,x is maximum? (b) If particle 2 has charge -q2=-3e, what is the value of that maximum?

    Found on Page 653
  5. In Fig. 22-29, an electron e travels through a small hole in plate A and then toward plate B. A uniform electric field in the region between the plates then slows the electron without deflecting it. (a) What is the direction of the field? (b) Four other particles similarly travel through small holes in either plate Aor plate Band then into the region between the plates. Three have charges+q1,+q2, and.−q3The fourth (labeled n) is a neutron, which is electrically neutral. Does the speed of each of those four other particles increase, decrease, or remain the same in the region between the

    Found on Page 652
  6. Two charged particles are fixed to an xaxis: Particle 1of chargeq1=2.1×10−8Cis at positionx=20cmand particle 2 of chargeq2=−4.00q1is at positionx=70cm.At what coordinate on the axis (other than at infinity) is the net electric field produced by the two particles

    Found on Page 653
  7. +QIn Fig. 22-30a, a circular plastic rod with uniform charge+Qproduces an electric field of magnitude Eat the center of curvature (at the origin). In Figs. 22-30b, c, and d, more circular rods, each with identical uniform charges, are added until the circle is complete. A fifth arrangement (which would be labeled e) is like that in dexcept the rod in the fourth quadrant has charge-Q. Rank the five arrangements according to the magnitude of the electric field at the center of curvature, greatest

    Found on Page 652
  8. When three electric dipoles are near each other, they each experience the electric field of the other two, and the three-dipole system has a certain potential energy. Figure 22-31 shows two arrangements in which three electric dipoles are side by side. Each dipole has the same magnitude of electric dipole moment, and the spacing between adjacent dipoles is identical. In which arrangement is the potential energy of the three-dipole system greater?

    Found on Page 652
  9. Figure 22-40 shows a proton (p) on the central axis through a disk with a uniform charge density due to excess electrons. The disk is seen from an edge-on view. Three of those electrons are shown: electron ecat the disk center and electrons esat opposite sides of the disk, at radius Rfrom the center. The proton is initially at distance z=R=2.00 cmfrom the disk. At that location, what are the magnitudes of (a) the electric field Ec→ due to electron ecand (b) the netelectric field E→s,net due to electrons es? The proton is then moved to z=R/10.0. What then are the magnitudes of (c) E→cand E→s,net (d) at the proton’s location? (e) From (a) and (c) we see that as the proton gets nearer to the disk, the magnitude of E→cincreases, as expected. Why does the magnitude of E→s,net from the two side electrons decrease, as we see from (b) and (d)?

    Found on Page 653
  10. Figure 22-32 shows three rods, each with the same charge Qspread uniformly along its length. Rods a(of length L) and b(oflength L/2) are straight, and points Pare aligned with their midpoints.Rod c(of length L/2) forms a complete circle about point P. Rank the rods according to the magnitude of the electric field theycreate at points P, greatest first.

    Found on Page 652

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