10 minutes maximum! Can you do it in 5? |
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1. Which of these diagrams shows the magnetic field line pattern (red lines) around a single straight wire carrying a current?
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2-4. The diagram shows a current carrying conductor in a magnetic field. | |||||||||||||||||
2. Which law will predict the direction of the force on the wire?
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3. In which direction will the wire be pushed?
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4. The force on the wire is given by the formula F = B I L sinθ. The letter 'L' stands for....
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5. The diagram shows a coil of wire with a current flowing through it in the direction shown by the arrows. The coil is between 2 magnets as shown. |
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Which way will the coil move?
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6-8. An electron moves at a constant speed into a magnetic field as shown. (The dot/circle indicates the field is directed out of the screen). |
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6. In which direction will the electron be pushed as it enters the field?
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7. The experiment is repeated with a proton of the same magnitude of charge and moving at the same velocity, but with a much higher mass than the electron, and the charge sign is positive. Which of these statements is true for the size of the resulting force, compared to the force on the electron?
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8. Another electron moves upwards at constant speed, this time it is already within the field as shown. |
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Assuming the field covers a large area, which of these statements best describes the subsequent motion of the electron?
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9. What is the name of a long (empty) coil of wire used to produce a magnetic field?
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10. The Earth's magnetic field is of the order of 10-5 Tesla. To produce a force of 1 N on a wire of length 10 m (held perpendicularly to the field) the current flowing must be....
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