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1. The problem statement, all variables and given/known data

Consider a mass spectrometer used to separate the two isotopes of uranium, 238U3+ and 235U3+. Assume the ions enter the magnetic field region with a speed of 5.30X10^5 m/s. What value of B is required to give a separation of 0.6 mm when the ions leave the spectrometer?

2. Relevant equations

L = 6*10^(-4) m and B = ? T v = 5.30*10^5

e = 1.602*10^(-19)

F = qvXB

3. The attempt at a solution

I know that F = qvXB q = 92e since e = 1.602*10^(-19) so F/qv = B ,

q = 92(1.602*10^(-19)), v = 5.30*10^5

I am not sure how to calculate the force

but I get confused because they are both ions they would have a positive charge and want to repel so why should they attract and I do not know where to take it from here.

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# Magnetic Field required to seprate to ions

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