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The figure shows a conducting wire wound in a helical shape so as to form a spring. The bottom end of the wire barely touches mercury (a good electrical conductor). After the switch is closed, current in the circuit causes the light to glow. The bulb will |
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Answer» The figure shows a conducting wire wound in a helical shape so as to form a spring. The bottom end of the wire barely touches mercury (a good electrical conductor). After the switch is closed, current in the circuit causes the light to glow. The bulb will
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