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A positive and a negative point charge move in the opposite direction with the same speed.
What is the direction of the magnetic force that the upper point charge exerts on the lower
one at the instant shown in the figure?
-9
++q
to the right
out of the page
O upward
O
to the left
zero
downward
into the page
left
▲ upward
A
right
downward
L

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