The circuit shows a source of EMF and some identical light bulbs. The switch, S,

Question

The circuit shows a source of EMF and some identical light bulbs. The switch, S, is opened at some point. The questions refer to the situation before and after the opening of S. Answer true or false for each statement. When S is closed, bulb 1 is brighter than bulb 2. When S is opened, bulb 1 becomes brighter. When S is opened, bulb 2 becomes brighter. When S is closed, the current through bulb 1 and the current through bulb 2 are the same. When S is opened, the potential difference across bulb 4 increases

Explanation / Answer

1) False

2) Ture

3) False

4) False

5) True

a) C1 =0.5 uF, C2 = C3 = 0.39 uF, V = 8 V

C23 = 0.39+0.39 = 0.78 uF

C123 = 0.5*0.78/(0.5+0.78)

C123 = 0.305 uF

b) Q = VC

Q123 = 0.305*8 = 2.44 uC

in series combination charge is constant

Q23 = 2.44 uC

V23 = 2.44/0.78 = 3.13 V

in parallel combinaiton voltage is constant

Q2 = 3.13*0.39

Q2 = 1.221 uC

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