18.5. Set Up: An electron has charge For a pair of point charges, Let and Let be the electron. The potential energy of the electron is the sum of and Solve: (a) (b) and Reflect: The potential energy is negative since the charge of the electron has opposite sign from the charge of each of the other two particles. The magnitude of the potential energy increases when the electron moves toward the larger charge. 18.6. Set Up: For a pair of point charges the electrical potential energy is In the O-H-N combination the is 0.170 nm from the and 0.280 nm from the In the N-H-N combination the is 0.190 nm from the and 0.300 nm from the other U is positive for like charges and negative for unlike charges. Solve: (a) O-H-N N-H-N The total potential energy is (b) In the hydrogen atom the electron is 0.0529 nm from the proton. The magnitude of the potential energy in the hydrogen atom is about a factor of 4 larger than what it is for the adenine-thymine bond. U
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This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.