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AP Physics C: E&M
12.3 Magnetic Fields of Current-Carrying Wires and the Biot-Savart Law
12.2 Magnetism and Moving Charges
BeginnerMCQConceptual19k
An electron moving parallel to a long current-carrying wire.
An electron moving parallel to a long current-carrying wire.
A long, straight wire lies along the x-axis and carries a constant current \(I\) in the positive x-direction. An electron is located on the positive y-axis at a distance \(d\) above the wire and is moving with speed \(v\) in the positive x-direction.

ChoiceDirection of magnetic field \(\vec{B}\)Direction of magnetic force \(\vec{F}_B\)
(A)Into the pageToward the wire (\(-y\)-direction)
(B)Into the pageAway from the wire (\(+y\)-direction)
(C)Out of the pageAway from the wire (\(+y\)-direction)
(D)Out of the pageToward the wire (\(-y\)-direction)

Which row in the table correctly indicates the direction of the magnetic field produced by the wire at the electron's position and the direction of the magnetic force exerted on the electron?

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