PH-2139
Charging by induction
Physics · Secondary 4 · Medium · Charging by induction
You want to charge a small metal ball negatively by induction using a positively charged rod. The ball is on an insulating stand.
Which sequence of steps will correctly give the ball a permanent negative charge?
Which sequence of steps will correctly give the ball a permanent negative charge?
- Bring rod near ball, earth the ball, remove earth wire, then remove the rod
- Bring rod near ball, earth the ball, remove the rod, then remove earth wire
- Earth the ball first, then bring rod near, then remove rod, then remove earth
- Touch the ball with the rod, then earth the ball, then remove both
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