1.) A pair of charged conducting plates produces a uniform field of 12,000 N/C,
ID: 3161287 • Letter: 1
Question
1.) A pair of charged conducting plates produces a uniform field of 12,000 N/C, directed to the right, between the plates. The separation of the plates is 40 mm. An electron is projected from plate A on the left, directly toward plate B on the right, with an initial speed of v0 = 2E7 m/s. What is the speed of the electron as it strikes plate B? m/s.
2.) Two charges of ±6.00 µC on the x-axis. the negative charge is at -5 cm and the positive one is at 5 cm. Find the magnitude of the electric field at point P on the y-axis, which is 7.00 cm from each charge. N/C
Explanation / Answer
here,
electric feild , E = 12000 N/C
the electric feild opposes the motion of electron
the magnitude of accelration on electron due to the electric feild , a = - e * E /me
a = - 1.6 * 10^-19 * 12000 /( 9.1 * 10^-31)
a = - 2.11 * 10^15 m/s^2
distance travelled , d = 40 mm = 0.04 m
initial velocity , v0 = 2 * 10^7 m/s
let the final velocity of the electron be v
v^2 - v0^2 = 2 * a * d
v^2 - (2 * 10^7)^2 = 2 * 0.04 * 2.11 * 10^15
v = 1.52 * 10^7 m/s
the final speed of electron is 1.52 * 10^7 m/s
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