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Homework Help: How do i get the Acceleration?

  1. Apr 16, 2006 #1
    An electron has a velocity of 5 x 10^6 m / s perpendicular to a magnetic field of 1.5 T. What force and acceleration does the elcetron experience?

    ok i get the Force part by using F=qvB, how do i get the Acceleration?

    F= 1.2x10^-12 N A= ?
  2. jcsd
  3. Apr 16, 2006 #2
    Remember Newton's second law? F=ma, F is force, m is mass, a is acceleration.
  4. Apr 16, 2006 #3

    i know this but how do i get the acceleration when i dont have the mass of the electron?
  5. Apr 16, 2006 #4


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    electron mass = 9.10938188 × 10^-31 kilograms

    All electrons have approx. the same mass.
  6. Apr 16, 2006 #5

    f=ma, a = m/f , a = 9.1x10^-31 / 1.2x10^-12 = 7.6 x 10 - 19

    the answer according to the back of the text book is way different a = 1.32x10^18m/s^2

    maybe the answer is wrong? in the book
    Last edited: Apr 16, 2006
  7. Apr 16, 2006 #6


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    You solved for acceleration incorrectly.
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