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Math Help - Please help me with this physic excercise as soon as possible.

  1. #1
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    Please help me with this physic excercise as soon as possible.

    A charged particle that moves with the speed v=8x10(7) goes in a magnetic field where B=0.7 T (B is the induction) and it makes an angle λ=45◦ with force lines. How is the specific charge (q/m) if the radius is R=4 cm?
    (qvb =mv2/R qvb is the formula of the Lorenz force and mv2/R is the centripetal.)
    Sorry for my english!
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  2. #2
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    Quote Originally Posted by blertta View Post
    A charged particle that moves with the speed v=8x10(7) goes in a magnetic field where B=0.7 T (B is the induction) and it makes an angle λ=45◦ with force lines. How is the specific charge (q/m) if the radius is R=4 cm?
    (qvb =mv2/R qvb is the formula of the Lorenz force and mv2/R is the centripetal.)
    Sorry for my english!
    I assume by force lines you mean the magnetic field lines?

    q \vec{v} \times \vec{B} = qvB~sin(45)

    so
    qvB~sin(45) = \frac{mv^2}{R}

    \frac{q}{m} = \frac{v}{RB~sin(45)}

    -Dan
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