A tiny sphere of mass 8.20 mg and charge −2.80 nC is initially at a distance of 1.54 ?m from a fixed charge of +8.05 nC. (a) If the 8.20-mg sphere is released from rest, find its kinetic energy when it is 0.500 ?m from the fixed charge. ______ J (b) If the 8.20-mg sphere is released from rest, find its speed when it is 0.500 ?m from the fixed charge. _______ m/s
1. A tiny sphere of mass 8.20 mg and charge −2.80 nC is initially at a distance of 1.54 ?m from a fixed charge of +8.05 nC.
(a) If the 8.20-mg sphere is released from rest, find its kinetic energy when it is 0.500 ?m from the fixed charge. ______ J
(b) If the 8.20-mg sphere is released from rest, find its speed when it is 0.500 ?m from the fixed charge. _______ m/s
2. A parallel-plate capacitor has a capacitance 1.50 ?F.
(a) How much energy is stored in the capacitor if it is connected to a 16.00-V battery? _____ ?J
(b) If the battery is disconnected and the distance between the charged plates doubled, what is the energy stored? _____?J
(c) The battery is subsequently reattached to the capacitor, but the plate separation remains as in part (b). How much energy is stored? ____?J
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