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Problem
Problem
A proton moves at a constant velocity of 50 m/s along the
x
x
x
-axis, in uniform electric and magnetic fields. The magnetic field is
B
=
(
2.0
mT
)
j
^
\mathbf{B} = (2.0 \text{ mT})\hat{j}
B
=
(
2.0
mT
)
j
^
. What is the electric field?
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