1) A beam of protons is accelerated easterly from rest through a potential diffe
ID: 1282942 • Letter: 1
Question
1) A beam of protons is accelerated easterly from rest through a potential difference of 2.0kV. It enters a region where there exists an upward pointing uniform electric field. This field is created by two parallel plates separated by 18cm with a potential difference of 250V across them.
Find the magnitude of the magnetic field (perpendicular to E) needed so the beam passes undeflected through the plate. B = --------------- T
2) Two long, parallel wires separated by 50cm each carry currents of 2.0A in a horizontal direction.
Find if they are in opposite directions. B = ----------------- T
Explanation / Answer
1. eLECTRIC FIELD E = V/d
E = 250/0.18
E = 1.388*10^3 N/C
as E = BV
speed v = sqrt(2eV/m)
v = sqrt(2*1.6e-19 * 2000/9.11e-31)
v = 2.65*10^7 m/s
B = 1.388e3/(2.65e7)
B = 5.23*10^-5 T
---------------------------------------
Bnet = B1- B2
Bnet = 0
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