Showing 441 to 450 of 631 Questions
  • On a dry winter day you scuff your leather-soled shoes across a carpet and get a shock when you extend the tip of one finger toward a metal doorknob. In a dark room you see a spark perhaps 5 mm long. Make order-of-magnitude estimates of (a) Your electric potential and (b) The charge on your body before you touch the doorknob. Explain

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    288
  • On average, the electron and proton in a hydrogen atom are separated by a distance of 5.3 x 10-11 m(Fig. 15.30). Assuming the orbit of the electron to be circular, (a) What is the electric force on the electron? (b) What is the electron’s orbital speed? (c) What is the magnitude of the electron’s centripetal acceleration in units o

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  • On planet Tehar, the free-fall acceleration is the same as that on Earth but there is also a strong downward electric field that is uniform close to the planet’s surface. A 2.00-kg ball having a charge of 5.00 μC is thrown upward at a speed of 20.1 m/s, and it hits the ground after an interval of 4.10 s. What is the potential diffe

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    764
  • Over a certain region of space, the electric potential is V = 5x - 3x2y + 2yz2. Find the expressions for the x, y, and z components of the electric field over this region. What is the magnitude of the field at the point P that has coordinates (1, 0, -2) m?

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    294
  • Point charges of equal magnitudes (25nC) and opposite signs are placed on diagonally opposite corners of a 60 cm x 80 cm rectangle. Point A is the unoccupied corner nearest the positive charge, and point B is the other unoccupied corner. Determine the potential difference VB – VA.

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    113
  • Points A, B, and C are at the corners of an equilateral triangle of side 3 m. Equal positive charges of 2 μC are at A and B. (a) What is the potential at point C? (b) How much work is required to bring a positive charge of 5 μC from infinity to point C if the other charges are held fixed? (c) Answer parts (a) and (b) if th

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    154
  • Proton in a well figure shows electric potential V along an x axis. The scale of the vertical axis is set by Vs = 10.0 V. A proton is to be released at x = 3.5 cm with initial kinetic energy 4.00eV. (a) If it is initially moving in the negative direction of the axis, does it reach a turning point (if so, what is the x coordinate of that p

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    521
  • Protons from a Van de Graaff accelerator are released from rest at a potential of 5 MV and travel through a vacuum to a region at zero potential. (a) Find the final speed of the 5-MeV protons. (b) Find the accelerating electric field if the same potential change occurred uniformly over a distance of 2.0 m.

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    103
  • Relative to the positive plate in Exercise 22, where is the point with a potential of 14 V? In exercise Determine the potential 2.5 mm from the negative plate of a pair of parallel plates separated by 20.0 mm and connected to a 24-V battery.

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  • Repeat Exercise 33 if the plates are instead connected to a 24-V battery. Also determine the electric field (direction and magnitude) at the midway point between the plates. Compare your answers to Exercise 33 and comment on the source of any differences. In exercise Consider a point midway between the two large charged plates in Fig. 16.

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