Why must we scrape the coating off of the ends of the wire? Why do we scrape it from only one side of one of the ends?

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Why must we scrape the coating off of the ends of the wire? Why do we scrape it from only one side of one of the ends? 

Activity 2: Building the motor.
Materials:
• D battery
• Insulated 22G wire
• 2 large-eyed, long, metal sewing
needles (the eyes must be large
enough to fit the wire through)
• Modeling clay
• Electrical tape
Hobby knife
• Small circular magnet
• Thin marker
magnet
electrical
tape
Transcribed Image Text:Activity 2: Building the motor. Materials: • D battery • Insulated 22G wire • 2 large-eyed, long, metal sewing needles (the eyes must be large enough to fit the wire through) • Modeling clay • Electrical tape Hobby knife • Small circular magnet • Thin marker magnet electrical tape
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