PHYS 24100 Midterm: Ex2_F06
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November 9, 2006: ( 5 points) a resistance r and a 3. 9 h inductance are in series across a 60 hz ac voltage. The voltage across the resistor is 23 v and the voltage across the inductor is 35 v. Assume that all voltages in this problem are rms voltages. What is the resistance r (in ohms): 2. 56, 154, 966, 356, 2237. November 9, 2006: ( 5 points) at one instant an electron is moving in the xy plane, the components of its velocity being vx = 5 x 105 m/s and vy = 3 x 105 m/s. A magnetic field of 0. 8 t is in the positive x direction. A 0. 7 t uniform magnetic field is in the plane of the triangle and is perpendicular to the hypotenuse. The radius of the resulting electron trajectory is: (a) b. It lies in the xy plane in a uniform magnetic field. B = 0. 4 t i + 0. 3 t k .
