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A proton (mpr
= 1.67 x 10-27 kg) is accelerated (from rest) through a 1.0 kV potential. It then passes undeflected through a velocity selector. If the magnitude of the
magnetic field inside the velocity selector is 15.0 mT, what is the magnitude of the electric field inside the velocity selector?
O 6.5 kV/m
O 4.9 kV/m
32 mV/m
3.1 mV/m
5.3 mV/m
28 kV/m

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