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A grad student is trying to build a velocity selector, shown below.


A grad student is trying to build a velocity selector, shown below. Charged particles will enter the velocity selector from the bottom and only those with the correct velocity v will be able to move in a straight line and leave at the top. The grad student's velocity selector has the electric field E pointing to the left, and the magnetic field B is pointing into the page. Explain why this arrangement will not work as a velocity selector.

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