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PHY222_hw_4_ch24 - Physics 222 Homework#4 on Chapter 24 of...

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Physics 222 Homework #4 on Chapter 24 of text Choose the best answer from each question. 1. The figure above shows two point charges, Q 1 = +60 nC (at origin) and Q 2 = -90 nC (0.8m to the right of Q 1 ). An electron is released from rest at point C. The speed (in m/s) of the electron as it arrives at infinity is closest to A) 1.7x10 7 B) 1.5x10 7 C) 1.3x10 7 D) 1.9x10 7 E) 1.1x10 7 Use the following to answer questions 2-4. Figure 1: A charge Q = -800 nC is uniformly distributed on a ring of 2.4 m radius. A charge q = +600 nC is placed at the center of the ring. Points A and B are located on the axis of the ring, as shown. 2. The work done by an external force that transports an electron from B to A is closest to: A) -500 eV B) -700 eV C) +500 eV D) -300 eV E) +700 eV 3. The electric potential is equal to zero at a point on the axis of the ring. The distance of this point from the center of the ring is closest to:
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