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Select the right word given in the box:
 
potential difference 
electrically neutral
 conventional current
William Gilbert
electric current
Movement of the leaves
\(1600\)
Electroscope
  higher potential
 metals
Abraham Bennet
lower potential
  
1. The flow of electric charge constitutes .
 
2.  invented the first electroscope.
 
3. The first electroscope is invented in the year .