Just after the switch is closed, rank the magnitudes of the four voltages Vbat,
ID: 1974213 • Letter: J
Question
Just after the switch is closed, rank the magnitudes of the four voltages Vbat, VA, VB, and Vcap.
a) Vbat=VA=VB= Vcap
b) Vbat=VA=VB>Vcap
c) Vbat=VA=Vcap>VB
d) Vbat>VA=VB>Vcap
e) VA=VB>Vcap>Vbat
Explain your reasoning for the above.
After the switch has been closed for a long time, rank the magnitudes of the currents ibat, iA, and iB. (Assume that the battery is ideal.)
a) ibat = iA = iB
b) ibat > iA = iB
c) ibat = iA > iB
d) iA > iB > ibat
Explain your reasoning. If any of these currents are zero, state so explicitly.
Just after the switch is opened, the voltage across bulb A (in V) is:
a) 8
b) 6
c) 4
d) 2
e) 0
Explanation / Answer
1)
just after the switch is closed the capacitor is short circuited so that the voltage drop across the capacitor is 0V and the two bulb is in parallel with the supply voltage so that option (b) is correct
2)
after the switch is closed for a long time the capacitor will be open circuited and in that case the conduction of current through the capacitor is almost zero so that the current will not flow through the B and therefore the option (c) is correct
3)
when the switch is closed for long time the capacitor will fully carged and the voltage across it is 4V ,just after opening of the switch the voltage across bulb A is 4.0 V because it is in parallel with the capacitor
so the option (c) is correct
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