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Physics II Lab w answers_Part_26

Physics II Lab w answers_Part_26 - By Kirchoff s second law...

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63 By Kirchoff’ s second law 0 C q t d q d R 2 = ° ± ² ³ ´ µ + ° ° ± ² ³ ³ ´ µ --------------------------------------- (3) w ith the solution (taking q=q o at t=0) ° ° ± ² ³ ³ ´ µ - = C R t exp q ) t ( q 2 0 ---------------------------------------(4) Thus the charge on the capacitor decays exponentially with time. In fact after a time t=R 2 C (equal to the discharging time constant ) the charge drops from it’ s initial value q o by a factor of e -1 . II.2 In this experiment we will measure the quantity of charge present in the capacitor by discharging it through a ballistic galvanometer . The circuit for the experiment is shown in fig.2. fig 2. A solar cell generates emf upon being illuminated by a light source. The ballistic galvanometer is a sensitive detector of small quantities of charge. Thus, it is sufficient to charge the capacitor with solar cell, which typically produces an output of about 0.1 0.3 V. When the switch S 1 is in the position L ° M and the switch S 2 is in the position A ° B, then the capacitor gets charged. The time constant for charging is ° 1 =R 1 C.If the switch S
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