Electric Potential, Potential Energy

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Presentation transcript:

Electric Potential, Potential Energy

Work and Potential Energy In Physics 1: W = F * d = ΔPE + ΔKE This is only true for constant Force, since our force is not constant: WAB = kqq/rA – kqq/rB (J)

How much work does the field do if we assemble three charges from infinitely far away? + 2μC 1m

How much work does the field do if we assemble three charges from infinitely far away? - 3μC - 0.5m 0.5m 0.5m - 3μC

Electric Potential Energy When gravity does negative work on an object it gains PE, when gravity does positive work on an object it looses PE. Work done by Electric forces behave the same way. ΔEPE = -W = kqq/rB – kqq/rA (J)

What is the change in potential energy of the bottom charge if we bring it from infinitely far away? (assume top charges are already present) 3μC - 3μC - 0.5m 0.5m 0.5m - 3μC

Electric Potential (voltage) Electric Potential is the Electric Potential Energy divided by the magnitude of the charge. (sound familiar?) ΔV = ΔEPE/q = kq/rB – kq/rA (V)

What is the change in potential or voltage in the middle of the Charges compared to infinitely far away? 3μC + 2μC X + 1.5m 1.5m

Other than infinity where is the voltage zero? 3μC - 2μC + 3m