# Homework Help: A simple physics 12 question

1. Jun 6, 2004

### invinc1ble

I don't know if this is the place to post this, but This is a simple Grade 12 Physics question that I have been working on for about half an hour now.

For those who don't normally use this notation,
2E10 = 2X10^10.
2E-2 = 2X10^-2

"A magnetic field of 3.4E-3T deflects electrons into a circular path of radius .014m. The electorns have been accelerated through a potential differenc eof 250V. If the charge of an electron is 1.6E-19C, what is the mass of the electron?"

I have done it three times, and I keep getting 7.25E-31Kg when in actuality, a real electron is 9.11E-31Kg

Last edited: Jun 6, 2004
2. Jun 6, 2004

### chroot

Staff Emeritus
Do you really mean 3,400 tesla? I doubt it.

- Warren

3. Jun 6, 2004

### invinc1ble

sorry.. i'd make that 3.4E-3T
(.0034)

4. Jun 6, 2004

### chroot

Staff Emeritus
5. Jun 6, 2004

### invinc1ble

I did this question from a worksheet, and we both got identical answers.

If you have the same answer that my friend and I do, then chances are it is correct.