PHYS 2220 Midterm: 2014_ex3
31 Jan 2019
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Circle your discussion ta: mei hui teh (lcb 215) You may use your one sheet of notes and formulas, but you must not collaborate with any other person. Do all four problems, showing your method and working clearly (a correct answer alone is not necessarily sufficient). Be sure to include correct si units in your answers where appropriate. The magnetic field is reduced steadily to zero over a time interval at. x x x x x x. B x x x x x (i) find the value of at such that the bulb will shine at full brightness during this time, [2] (b) a toroidal coil of square cross section has inner radius a and outer radius b. It consists of n turns of wire and carries a time-varying current i(t) - i max sin cot. A single-turn wire loop encircles the toroid, as shown in the figure at the right.
