1. Consider the circuit shown where switch S has been open for a long time. If t
ID: 2301836 • Letter: 1
Question
1. Consider the circuit shown where switch S has been open for a long time. If the source of emf and the inductor both have negligible resistance, which of the following best describes the current in the circuit after S is closed at t = 0.
A, D, B, E, C
2. Consider two inductors connected in parallel such that none of the flux from one passes through the other. The effective inductance of the pair of inductors is given by:
3. The diagram shows an inductor that is part of a larger circuit. The direction of the induced emf in the inductor is as indicated. Which of the following is possible?
The current is to the right and decreasing
The current is to the left and constant
None of the above
The current is to the right and constant
The current is to the left and decreasing
4. Consider the circuit shown where switch S has been closed for a long time and the inductor is ideal, ie; has negligible resistance. Switch S is now opened. Immediately following this the potential difference across the 900 ? resistor is:
5. Consider two identical circular loops of wire positioned close together that are connected in series as shown in the diagram. If the inductance of one loop is L, the effective inductance of the combination is most nearly:
Explanation / Answer
1) D
2) (L1*L2)/(L1+L2)
3) current is right and decreasing
4) 9V
5) L/2
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