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A charged oil drop of mass m and electric charge q falling through air experiences a resistive force - myu. Starting from rest, it falls for a time interv I. At time t = 71, an oscillating electric field E Eo cos wt is turned on. (Suppose that 2 = 0 at t = 0 and is positive in the downward direction 1. For 0 <t <T, the motion of the particle is best described by which of the following for 2(t): (a) Ae* (b) + C) e (d) At - Ben + C, for some constants A, B, C. 2 O(c) Old) O(a) O(b) 2. Suppose that the steady state motion after t > Ti is described by z(t) = A cos(wt + 8). The values of the constants are QE. ; (9²T² qE; qEO (b) ( 1. A= (a) + gé(1 - e-V)2 -T2 (d) mw sw² + y² 72 O(c) Old) (a) O(b) in mw? i-e I 2. tan = (a) (b) © (d) 0 WT wli O(b) O(a) O(d) O(C) 3. The motion z(t) of the drop after T is best described by which of the following graphs zo A (2) (4) (3) t
3. The motion (1) of the drop after Ti is best described by which of the following graphs 20 200 ལབ་ཡོང་བས་ཡབ་མཁའ་མཉམ་ AA (1) (2) (3) ) (4) (2) (1) (3) O(4)