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Exam3_2008Spring_Conflict_Solutions

Exam3_2008Spring_Conflict_Solutions - MASSACHUSETTS...

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MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics 8.02 Spring 2008 Conflict Exam Three: Solution Section I: (25 points) Five Concept Questions. Please circle your answers. Question 1 (5 points): In an LC circuit, the electric and magnetic fields are shown in the figure. At the moment depicted in the figure, the energy in the circuit is stored in 1. The electric field and is decreasing 2. The electric field and is constant 3. The magnetic field and is decreasing 4. The magnetic field and is constant 5. In both the electric and magnetic field and is constant 6. In both the electric and magnetic field and is decreasing Solution: (b). At the instant in question the energy is only stored in the electric field. The energy is constant because there is no energy dissipation through a resistor. Note that because the charge on the capacitor decreases and the current increases, the energy stored in the electric field is decreasing and the energy stored in the magnetic field increases.
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