lectronic types neglect the force of gravity on electrons. To see why, compute t
ID: 1549948 • Letter: L
Question
lectronic types neglect the force of gravity on electrons. To see why, compute the force of the Earth's gravity on an electron and compare it with the force exerted on the electron by an electric field of magnitude 9000 V/m (a relatively small field). The mass and charge of an electron are given on the inside back cover. N (force due to gravity
) N (force due to electric field)
2. A droplet of ink in an industrial ink-jet printer carries a charge of 4 10-13 C and is deflected onto paper by a force of 2.4 10-7 N. Find the strength of the electric field to produce this force.
N/C
3. The potential difference between a storm cloud and the ground is 100 million volts. If a charge of 7 C flashes in a bolt from cloud to Earth, what is the change of potential energy of the charge?
J
Explanation / Answer
1. Fg = m g = 9.109 x 10^-31 x 9.8
= 8.94 x 10^-30 N
Fe = q E = 1.6 x 10^-19 x 9000
= 1.44 x 10^-14 N
2. F = q E
2.4 x 10^-7 = 4 x 10^-13 x E
E = 600 x 10^3 V / m
3. V = 100 x 10^6 Volts
change in PE = q E = 7 x 100 x 10^6 J
= 700 x 10^6 J
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