Atotal charge of 16μc passes through a cross-sectional area of a nichrome wire in 4 s. how many electrons pass through the cross-sectional area in 16 s?

Assuming that the flow of charge remains constant, we can just multiply 16microc by 4 because we want to know the amount of charge going by in four times the time.

16microc × 4 = 64microc

Now to find the amount of electrons, we know that one electron has a charge of 1.6x10^-19 C so we divide 64x10^-6 C by that.

64x10^-6 / 1.6x10^-19 = 4x10^14 electrons

Julia would be observing a. static electricity was caused by her sweater rubbing against her shirt and transferring electrons. she didn't touch anything metal, so that would cancel out b.she most likely didn't rub her sweater against her hair either, so that cancels out c.she also didn't scoot across the carpet while trying to take her sweater off, that cancels out d.so that leaves a.a. is correct.