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# Ch18 - Q17.3a What is the direction of < 0 0 3> x < 0 4 0>...

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Q17.3a What is the direction of < 0, 0, 3> x < 0, 4, 0>? 1) +x 2) –x 3) +y 4) –y 5) +z 6) –z 7) zero magnitude

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Q17.3b What is the direction of < 0, 4, 0> x < 0, 0, 3>? 1) +x 2) –x 3) +y 4) –y 5) +z 6) –z 7) zero magnitude
Q17.3c What is the direction of < 0, 0, 6> x < 0, 0, -3>? 1) +x 2) –x 3) +y 4) –y 5) +z 6) –z 7) zero magnitude

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Q17.3d Direction of magnetic field at the observation location? 1) +x 2) –x 3) +y 4) –y 5) +z 6) –z 7) zero magnitude
Q17.3e Direction of magnetic field at the observation location? 1) +x 2) –x 3) +y 4) –y 5) +z 6) –z 7) zero magnitude

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Q17.3f At the observation location the magnetic field due to the proton is in the -y direction. What is a possible direction for the velocity of the proton? 1) +x 2) –x 3) +y 4) –y 5) +z 6) –z 7) zero magnitude
Q17.3g At the observation location the magnetic field due to the electron is in the -z direction. What is a possible direction for the velocity of the electron ? 1) +x 2) –x 3) +y 4) –y 5) +z 6) –z 7) zero magnitude

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Q17.7a As a guess, what do you expect for the distance dependence of the magnetic field of a long, straight, current-carrying wire?
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