D: A 0O N/C 20 10-2 mm Not: Figure not drawn to scale. Two parallel conducting p
ID: 1631134 • Letter: D
Question
D: A 0O N/C 20 10-2 mm Not: Figure not drawn to scale. Two parallel conducting plates, each of area area 0.30m, ar plate has a +Q; the other has a-Q. An electric f the diagram above. electric frel are separated by a distance of 2x 10 m of air. One eld of 5000 N/C is directed between the plates, as shown in (a) Indicate on the diagram which plate is (+) and which plate is negative (b) Determine the potential difference between the plates. 3pts 1pt 3pts (c) Determine the capacitance of this arrangement of plates. An electron is initially located midway between the plates. If an electron is released from rest at this location midway between the plates, determine the speed just before striking one of the plates. Assume gravitational effects are negigilible. 3 ptsExplanation / Answer
(A) Field is always directed from +ve to -ve plate.
right side plate is positively charged.
left side plate is negatively charged.
(B) V = E.d = (5000) (2 x 10^-2) = 100 Volt
(C) C = e0 A / d
= (8.854 x 10^-12) (0.30) / (2 x 10^-2)
= 1.328 x 10^-10 F
As electron is released from midway the plates.
electron will be accelerated towards right plate.
gain in KE = q deltaV
= (1.6 x 10^-19) (100/2)
= 8 x 10^-18 J
and KE = m v^2 / 2
8 x 10^-18 = (9.109 x 10^-31) v^2 / 2
v = 4.19 x 10^6 m/s
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