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The voltage marked on a light bulb is usu- ally either 110 or 120 V. The power of a light bulb is 60 W. It is connected to a power supply with voltage 120 V. Find the current flowing through the light bulb.
Answer in units of A
A parallel-plate capacitor has fixed charges +Q and -Q. The separation of the plates is then doubled. (a) By what factor does the energy stored in the electric field change? (b) How much work must be done in doubling the plate separation from d to..
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