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How to calculate the force on charge?

  1. Nov 29, 2015 #1
    1)In a physics lab a positive charge of 20nC is moved horizontally with a
    velocity of 10m/s due west.
    The magnetic field of the earth at this location is parallel to ground and
    from north to south.
    Calculate the force on the charge.

    2) the forumla could be : F = qvBsinθ = qv⊥B

    .. but i dont know how to calculate this, could you pls help me ? I am really not good physics student..
  2. jcsd
  3. Nov 29, 2015 #2


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    Staff: Mentor

    Welcome to the PF.

    In future schoolwork threads here, please use the Homework Help Template that you are provided when starting a new thread. The Template includes a place to put the Relevant Equations, and a place for your Attempt at a solution.

    Now, the equation you have written is applicable here. Are you familiar with the vector form of it? That's the easiest way to get the direction of the vector force. BTW, the equation is called the Lorentz Force equation.
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