Physics 1B Week 6 Solutions

Physics 1B Week 6 Solutions - Week 6 Physics 1B Schedule...

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Week 6 Physics 1B Schedule Finish up dipoles Gauss’s Law Revisit conductors Dipoles Dipoles are two charges (+ and -) separated by a distance l . If a dipole is placed in an E-field, then the sum of the forces will be 0. However, there will be torque that will try to turn the dipole. *Torque and Potential energy of a dipole in an electric field τ = QlE sin q U = - QlE cos q where Q is the charge on the end of the dipoles, l is the distance separating the charges, E is the e-field and θ is the angle between the E-field and the dipole moment. Question 1 The HCl molecule has a dipole moment of about 3.4 x 10-30 C m. The two atoms are separated by about 0.1 nm. (a) What is the net charge on each atom? Bonus: Is this equal to an integral multiple of e? If not, why? (b) What maximum torque would this dipole experience in a 2.5 x 10 4 N/C electric field? (c) How much energy would be needed to rotate one molecule 45 ° from its equilibrium position of lowest potential energy.

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Flux and Gauss’s Law Notations: Φ E = Electric Flux E = Electric field
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This note was uploaded on 10/26/2011 for the course PHYSICS 1B taught by Professor Corbin during the Spring '11 term at UCLA.

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Physics 1B Week 6 Solutions - Week 6 Physics 1B Schedule...

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