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Chapter 24: Electric Potential

Fundamentals Of Physics
Pages: 685 - 716

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111 Questions for Chapter 24: Electric Potential

  1. A charge of1.50×10-8Clies on an isolated metal sphere of radius 16.0 cm. With V=0at infinity, what is the electric potential at points on the sphere’s surface?

    Found on Page 716
  2. In Fig. 24-72, two particles of charges q1and q2are fixed to an x-axis. If a third particle, of charge+6.0μC, is brought from an infinite distance to point P, the three-particle system has the same electric potential energy as the original two-particle system. What is the charge ratioq1/q2?

    Found on Page 716
  3. A particle of charge+7.5μCis released from rest at the pointx=60cmon an x-axis. The particle begins to move due to the presence of a charge Qthat remains fixed at the origin. What is the kinetic energy of the particle at the instant it has moved 40 cmif (a)Q=+20μCand (b)Q=-20μC

    Found on Page 713
  4. (a) what is the electric potential energy of two electrons separated by 2.00 nm? (b) If the separation increases, does the potential energy increase or decrease?

    Found on Page 713
  5. In the rectangle of Fig. 24-55, the sides have lengths 5.0 cmand15 cm, q1= -5.0 mC, and q2= +2.0 mC. With V=0at infinity, what is the electric potential at (a) corner Aand (b) corner B? (c) How much work is required to move a charge q3= +3.0 mCfrom Bto Aalong a diagonal of the rectangle? (d) Does this work increase or decrease the electric potential energy of the three-charge system? Is more, less, or the same work required if q3 is moved along a path that is (e) inside the rectangle but not on a diagonal and (f) outside the rectangle

    Found on Page 713
  6. Two tiny metal spheres Aand B,massmA=5.00gandmB=10.00g, have equal positive chargeq=5.00μC. The spheres are connected by a mass less non-conducting string of length d=1.00 m, which is much greater than the radii of the spheres. (a) What is the electric potential energy of the system? (b) Suppose you cut the string. At that instant, what is the acceleration of each sphere? (c) A long time after you cut the string, what is the speed of each sphere?

    Found on Page 713
  7. A positron (charge +e, mass equal to the electron mass) is moving at 1.0x107 m/sin the positive direction of an xaxis when, at x=0, it encounters an electric field directed along the xaxis. The electric potential Vassociated with the field is given in Fig. 24-57. The scale of the vertical axis is set by Vs=500.0 V. (a) Does the positron emerge from the field at x=0(which means its motion is reversed) or at x=0.50 m(which means its motion is not reversed)? (b) What is its speed when it emerges?

    Found on Page 713
  8. In Fig. 24-60, a charged particle (either an electron or a proton) is moving rightward between two parallel charged plates separated by distance d=2.0 mm. The plate potentials are V1= -70.0 Vand V2= -50.0V. The particle is slowing from an initial speed of 90.0 km/sat the left plate. (a) Is the particle an electron or a proton? (b) What is its speed just as it reaches plate 2?

    Found on Page 714
  9. Sphere 1 with radius has positive charge . Sphere 2 with radius is far from sphere 1 and initially uncharged. After the separated spheres are connected with a wire thin enough to retain only negligible charge, (a) is potential of sphere 1 greater than, less than, or equal to potential of sphere 2? What fraction of ends up on (b) sphere 1 and (c) sphere 2? (d) What is the ratio of the surface charge densities of t

    Found on Page 714
  10. Two metal spheres, each of radius 3.0 cm, have a center-to-center separation of 2.0 m. Sphere 1 has charge +1.0×10-8C; sphere 2 has charge-3.0×10-8C. Assume that the separation is large enough for us to say that the charge on each sphere is uniformly distributed (the spheres do not affect each other). Withdata-custom-editor="chemistry" V=0at infinity, calculate (a) the potential at the point halfway between the centers and the potential on the surface of (b) sphere 1 and (c) sphere 2.

    Found on Page 714

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