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## Homework Statement

This is just a short response problem on my homework. It asks:

"If a particle is moving at a relativistic velocity, is the following equation still valid?

|q|vB = mv

^{2}/r

If the particle is an electron, what is the value of the mass?" (electron mass = 9.1094x10

^{-31})

## Homework Equations

|q|vB = mv

^{2}/r

## The Attempt at a Solution

I would think that the equation still applies. Velocity is relative so it does not change when the frame of reference changes. Is that correct? Would I also just use the given electron mass for the mass? Maybe I'm thinking too much... Would .511MeV/c

^{2}work too?

One side question. Would the radius be a contracted length? How would that be calculated? Any help is greatly appreciated. Thank you so much!