Question 1
Magnetic switches are often used in:
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alarm systems.
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radios.
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motors.
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transformers.
Question 2
Permanent horseshoe-shaped magnets:
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retain their magnetism longer than the bar type.
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will not retain their magnetism as well as the bar type.
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will not provide as strong a magnetic field as a bar magnet.
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provide a much stronger magnetic field than a bar magnet of equal material.