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Problem Set 18 Session 1, week 7 Supplemental Instruction Iowa State University Leader: Course: Instructor: Date: Noah Phys 222 Prell 03/03/15 1. An electron is traveling to the right with a speed of 8.5 x 106 m/s when a magnetic field is turned on. The strength of the magnetic field is 0.050 T, and it is directed into the paper. (a) Describe the path of the electron after the field has been turned on (assuming only magnetic effects). (b) What is the magnetic flux through a cube drawn around the electron? 2. An electric field of 1500 V/m and a magnetic field act on an electron moving with a speed of 3000 m/s. If the resultant field is to be zero what should be the strength of the magnetic field (in Wb/m2)? 3. A water droplet of radius 1 micrometer is charged so that the electric field on its surface is 5.8 mV/meter. (a) How many electrons does the droplet carry? (b) How strong a vertical electric field is required to prevent it from falling? (assume no drag from medium) 1060 Hixson-Lied Student Success Center 515-294-6624 [email protected] http://www.si.iastate.edu