# act10ans - Do NOT write on these sheets or take them with...

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Do NOT write on these sheets or take them with you…. The Next class needs them too! PHYS-1200 PHYSICS II SPRING 2006 Class 10 Activity: Displacement Current ANSWERS 1. The capacitor in the picture shown below is charging. a) What is the direction of the electric field between the plates of the capacitor? Down. The positive part of the battery is connected to the upper capacitor plate, so the capacitor has the same polarity as the battery. Electric fields go from + to -, so E is down in the capacitor. Is the electric field constant, decreasing or increasing? Increasing, since the capacitor is charging. You are adding more charges to each plate as time goes on. b) Is there a displacement current? Why or why not? Yes. There is a changing electric field. c) If there is a displacement current what is its direction? Down. In this case, if the capacitor is charging, and since the Electric field is increasing, the displacement current goes in the same direction as the Electric field. d) What is the direction of the magnetic field associated with the displacement current at point P in the diagram? Into the page. Imagining displacement current to be a real current, you simply use the right hand rule, which says that if the "current" is down, the magnetic field must be into the page on the left side of the capacitor, or within the loop shown. 2. Now, suppose the capacitor in the picture shown above is fully charged. a) What is the direction of the electric field between the plates of the capacitor? Down.

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act10ans - Do NOT write on these sheets or take them with...

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