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I need help deriving a formula to solve for this please.

A proton has a speed of 3 x 10^6 m/s in a direction perpendicular to a uniform magnetic field and the proton moves in a circle radius .2 m. what is the magnitude of the magnetic field?

If someone can show me the all formulas to use i can manipulate from here.

Thanks!

Dx

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# Homework Help: A proton has a speed of 3 x 10^6 m/s

**Physics Forums | Science Articles, Homework Help, Discussion**