Charging by friction and electrostatic phenomena

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Question 18
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A student holds a negatively charged polythene rod close to a neutral metal sphere that is mounted on an insulating stand. A negatively charged polythene rod is held near the left side of a metal sphere on an insulating stand. A finger touches the right side of the metal sphere to earth it. The student briefly touches the metal sphere with a finger to earth it, then removes their finger.

Explain why the metal sphere is left with an overall positive charge.

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Charging by friction and electrostatic phenomena Questions

  1. GCSE
  2. /Physics
  3. /Charging by friction and electrostatic phenomena