A 12.8-g piece of Styrofoam carries a net charge of -0.684 µC and is suspended in equilibrium above the center of a large, horizontal sheet of plastic that has a uniform charge density on its surface. What is the charge per unit area on the plastic sheet?
Solution:
Using the formula,
=> q * E = m*g at equilibrium
=> q * (σ/2eph) = m*g (eph stands for ephsilon not)
=> σ = 2 * eph * m * g / q
=> σ = 2 * 8.85 * 10^-12 * 12.8 * 10^-3 * 9.8 / (-0.684 * 10^-6)
=> σ = -3.246 * 10^-6
=> σ = 3.246 micro C/m^2
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Two very large parallel sheets are 5.00 cm apart. Sheet A
carries a uniform surface charge density of -6.80 μC/m2 , and sheet
B, which is to the right of A, carries a uniform charge density of
+12.1 μC/m2 . Assume that the sheets are large enough to be treated
as infinite.
PART C:
Part E:
Any help accounting for both
of these questions would be very appreciated, please include the
work and explanations to go along with them.
Problem...