I'm confident I have the method for solving this right. I used the formula for kinetic energy and voltage (1/2mv^2=qV) and combined it with my modified magnetic force formula (r=mv/qB) to get:
r=sqrt of ((2mV/q)/B)
The strength of B is 3.0x10^3 in Tesla.
The answer I got when I substituted mass of electron for m, voltage for V, charge of electron for q and field strength for B was r=4.0x10^-3m. My instructor says this is wrong though and I have no idea where I'm making a mistake since I've checked it a bunch of times.
r=sqrt of ((2mV/q)/B)
The strength of B is 3.0x10^3 in Tesla.
The answer I got when I substituted mass of electron for m, voltage for V, charge of electron for q and field strength for B was r=4.0x10^-3m. My instructor says this is wrong though and I have no idea where I'm making a mistake since I've checked it a bunch of times.
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The "B" should not be under the square root.