Physics II Lab w answers_Part_27

Physics II Lab w answers_Part_27 - The deflection of the...

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65 The deflection of the coil is measured by the deflection of a light beam by the mirror attached to the coil (fig 4). This deflection is recorded as the linear deflection of the spot, X, that the reflected beam makes on the scale. Clearly X will also be directly proportional to the charge q discharged through the ballistic galvanometer. Thus, if the capacitor is discharged through the galvanometer after different charging / discharging times, the relation of X with time will be given by equations analogous to eqs (2) & (4). Note the damping key S in fig (2). When passed, this simply shorts the two ends of the galvanometer coil. fig 4 The oscillations of the coil get severely damped (why?). The damping key thus can used to stop the motion of the coil. . II. Set - up and Procedure: Part A: Measurement of time constant for charging of capacitor. 1. Connect the circuit as given in fig.2 with R 1 = 0 (i.e. without the resistance R 1 ). (This is to ensure that the charging of the capacitor by the solar cell is almost instantaneous) 2. Choose a filter for the light illuminating the solar cell. (The voltage output of the
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This note was uploaded on 11/26/2011 for the course PHY 2053 taught by Professor Lind during the Fall '09 term at FSU.

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Physics II Lab w answers_Part_27 - The deflection of the...

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