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I know Force produced by electric field is F=qE

I know Force produced by magnetic field is F=Bqv

How do i do this problem?? thanks.

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- Thread starter spoonthrower
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- #1

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I know Force produced by electric field is F=qE

I know Force produced by magnetic field is F=Bqv

How do i do this problem?? thanks.

- #2

berkeman

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spoonthrower said:what is a cross product?? I dont understand. do i add the two forces together??

the cross product of B and v would be the product of their magnitudes and sine of the angle between them. This will result in a vector with a direction normal to both B and v (right hand rule).

Yes, essentially what you need to do is add the two forces together.

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- #6

berkeman

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But when you combine the B and E fields as in this problem, you get some kind of spiralling motion, and the radius of the spiral generally changes as the particle has a net acceleration from the E field.

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