- #1

julianwitkowski

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## Homework Statement

A magnetic field of 0.0200 T [up] is created in a region.

a) Find the initial magnetic force on an electron initially moving at 5.00 E+6 m/s [N] in the field.

b) What is the radius of the circular path?

c) Make a sketch showing the path of the electron.

Electron Charge = q = 1.6⋅10

^{-19}

Coulomb Constant = k = 9⋅10

^{9}

## Homework Equations

F = qvB

F = k ⋅Q ÷ r

^{2}→ r = √ k ⋅Q ÷ E ?

F = qvB = mv

^{2}/r

a=qE/m

## The Attempt at a Solution

[/B]

a) F = qvB = 1.6⋅10

^{-19}⋅5⋅10

^{6}⋅2⋅10

^{-2}= 1.6⋅10

^{-14}

b) r = √ 9⋅10

^{9}⋅1.6⋅10

^{-19}÷ 1.6⋅10

^{-14}= 314.6

I'm kinda confused as to the distinction between F = k ⋅q ⋅q ÷ r

^{2}and E = k ⋅Q ÷ r

^{2}.

I hope I used this right, but I'm finding lots of different answers... My answer seems way to large unless it is not in meters... I'm getting 314 so I think this is wrong.

If it's wrong am I supposed to use F = qvB = mv

^{2}/r ? If this is true how am I supposed to use the rest mass of the electron?

a=qE/m and F=qvb? F=ma ... ?

For the diagram, I'm having trouble visualizing this.

If you can help me understand what the diagram should look like...

Extra kudos for a half tried paint brush image because I'm more a visual learner.

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