PH-707
Charging by induction
Physics · Secondary 3 · Hard · Charging by induction
A neutral metal sphere is mounted on an insulating stand. A negatively charged rod is brought close to one side of the sphere (without touching). The opposite side of the sphere is then briefly connected to Earth and the connection is removed before the rod is taken away.
What charge does the sphere have at the end of this charging by induction process?
What charge does the sphere have at the end of this charging by induction process?
- Positively charged, because electrons have flowed from the sphere to Earth
- Negatively charged, because electrons have flowed from Earth onto the sphere
- Still neutral, because there was no contact between rod and sphere
- Negatively charged, because electrons have moved from the rod to the sphere
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