Figure 7 shows a "windmill" which when connected to the dome of a positively charged Van de Graff generator is observed to rotate as indicated. A, B, C and D are sharp points.

      

Figure 7 shows a "windmill" which when connected to the dome of a positively charged Van de Graff generator is observed to rotate as indicated. A, B, C and D are sharp points.
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Explain how this rotation is caused.

  

Answers


John
Point action takes place at sharp points A, B, C and D. charge concentrates at these sharp points causing a high potential difference that ionizes the surrounding air. The positive ions are repelled causing these points to move in opposite direction due to reaction force.
johnmulu answered the question on May 26, 2017 at 12:45


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