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# HW2 - UC Berkeley EECS Department EECS 40 B E Boser HW2...

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UC Berkeley, EECS Department B. E. Boser EECS 40 HW2: Electronic Circuits UID: 1. In this problem we investigate charge neutrality. The force between two electrical charges q 1 and q 2 at distance r can be calculated using Coulomb’s law, F c = 1 4 πe 0 q 1 q 2 r 2 (1) a) Calculate the absolute value of the electrostatic force between an electron and a proton at distance r = mm. 1 pt. 0 b) From the assumption that the net charge on every circuit component remains zero at all times, it follows that currents i 1 and i 2 are equal in the circuit shown below. To get a better feel for the assumption, let’s assume instead that i 1 = 0 A and i 2 = mA. Then negatively charged electrons accumulate on X 2 , leaving behind positively charged atomic nuclei on X 1 . Calculate the attractive force (it is positive) between X 1 and X 2 after t = 1 s for X 1 and X 2 at a distance of mm (treat X 1 and X 2 as point charges). 1 pt. 1 c) How many loaded trucks weighing m = 40000 kg each can you lift with this force?

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