Saturday
July 26, 2014

Homework Help: physics

Posted by Determine the radius on Friday, April 3, 2009 at 9:32am.

An electron has a kinetic energy of 4.2 x 10-17 J. It moves on a circular path that is perpendicular to a uniform magnetic field of magnitude 3.3 x 10-5 T. Determine the radius of the path.

The electron in the problem has
Charge of the electron (q) = 1.6*10-19C
Mass of the electron (me) = 9.11*10-31kg

The equation I was told to use is,
r= √(2meKE) / qB

And the answer I got was 3.8 x 10 ^ -12



But that is not the correct answer. Please help!! THANK YOU!

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