the capacitor? b) The plates are pulled apart by distance dx. What is the change
ID: 3280674 • Letter: T
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the capacitor? b) The plates are pulled apart by distance dx. What is the change in stored enerey? 4. How many excess electrons should be added to one plate and removed from the other plate of a 5 F capacitor to give it 25l of stored energy. This energy can be converted in mechanical with 75% efficiency. How high Ig object can be lifted using the amount of energy stored in the capacitor? 5. The switch S in the circuit is originally open. a) What is the potential difference s? The switch is closed.Calculate b) the equivalent capacitance; c) the charge on each capacitor, d) the potential difference across each capacitor. ej How much charge flowed through the switch when it was closed? C-10F e-100v Calculate al the e to searchExplanation / Answer
5a) We know that since current is charge is constant in capacitors in series (Q=CV) higher capacitance have lower voltage. So Voltage at d, Vd= 66.67V, and similarly Vc = 33.33V
Vcd = 66.67 - 33.33 = 33.3 V answer
b] it will be series of (10+5) and (5+10) uF. So it will be seriesof two 15uF.
Equivalent capacitance Ceq = 7.5V answer
d] Each pair has equal capacitance, so voltage will be divided between the groups equally. So all capacitors will have 50V potential difference each.
c] Q=CV, Q1 = C1*50 = 5*50 = 250 uC
Q2 = C2*50 = 10*50 = 500 uC,
Q3 = 10*50 = 500 uC,
Q4 = 5*50 = 250 uC
E] prior to closing charge on each = 333 uC can be found by Q = CV
CHARGE FLOWN = 500+250 - (333+333) = 750 -667 = 83.33 uC ANSWER
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