To calculate the charge q3 in the capacitor c3 in part b you...

To calculate the charge Q3 in the capacitor C3 in part (b), you need to use the equation, Why is it necessary to use the equivalent capacitance, Ceq and not C3 to calculate the Q3? Look at Lec 8, slide #17 to answer this question. To calculate the charge Q3 in the capacitor C3 in part (b), you need to use the equation,

Transcript

00:01 Here in this given problem, these are the two capacitors which are arranged in a series combination and the capacitors are c1 and c2 and one capacitor that is in parallel with this series combination.

00:19 Nation this is c3 and these two terminals a and b and this middle terminal that is marked as d.

00:31 The values of these capacitance is c1 this is 3 nano farad c2 this is 6 nano farad and c3 that is 3 nano farad.

00:48 Voltage applied li dacros ab vab that is 3 volt.

00:53 In the first part of the problem we have to find equivalent capacitance of this combination ceq.

01:01 So first of all c1 and c2 these two are in series.

01:07 So as c1 and c2 are in a series combination.

01:15 So net capacitance of series combination that is given as c1 multiplied by c2 their product in numerator and their sum their addition in denominator so here it becomes 3 multiplied by 6 divided by 3 plus 6 so it is calculated to be equal to 2 nano farad now this cs is in parallel with this c3 so equivalent capacitance it will be given by cs plus c3 means this is 2 plus 3 nano farad and finally it is calculated to be equal to 5 nano farad and that is the answer for the first part of this given problem here.

02:05 Now in the second part of the problem there is a charge q2 at the right plate of capacitor c3 and we have to find this charge q2.

02:20 So obviously all these charges to the left side plate of all the capacitors these will be positive and at the right plates all these charges will be negative...

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