14.Which of the following descriptions about capacitor are incorrect. (A) Energy is stored in the electric field. (B) Capacitor performs like a short-circuit at steady state. (C) The capacitor current cannot be changed abruptly. (D) The power of capacitor can be positive or negative. (multiple choice)

1.In the figure shown on the right, a wire is extended from y = -(a+L) to y = a+L and is bent as a semicircle in the xy plane. If the wire carries a current I flowing along the direction indicated by the arrows and the magnetic flux density B in the region is along the +z direction, determine the magnetic force acting on the semicircular arc with the following parameters: I = 2 A, B = 5 T, a = 1 m, L = 2 m. (A) 10 Nt (B) 20 Nt (C) 30 Nt (D) 40 Nt (E) 5 Nt

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