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12.1 Check and Reflect Questions
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What is the law of magnetism?
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Does every magnet have a north and a south pole?
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Does every charged object have positive and negative charges?
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How did William Gilbert determine that Earth was a magnet?
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What is the most probable cause of magnetism in a bar magnet?
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What is the most probable cause of magnetism in Earth?
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What accidental discovery did Oerstead make?
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What is the shape of the magnetic field around a straight current carrying conductor?
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What is the shape of the magnetic field within a coil of conducting wire carrying a current?
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What would happen to a magnet if you broke it into two pieces?
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A negatively charged sphere is approaching you. Describe the magnetic field surrounding the sphere and its direction. What would happen if the sphere were positively charged?
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A spinning top is charged negatively and is spinning clockwise as observed from above. Describe the magnetic field created by the spinning top and direction.
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List two differences and two similarities between gravitational and electric fields.
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List two differences and two similarities between gravitational and magnetic fields.
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List two differences and two similarities between electric and magnetic fields.
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Using domain theory, explain the following observations: a magnet attracts an unmagnetized ferromagnetic material.
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Using domain theory, explain the following observations: stroking a nail with a magnet magnetizes the nail.
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Why does dropping or heating a bar magnet decrease its magnetic properties?
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Consider a bar magnet and Earth. (See check and reflect quesiton 13 for a diagram) Describe the similarities and the differences of their magnetic fields.
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Why is it difficult to get an accurate bearing with a magnetic compass in Iqaluit?
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