A positively-charged rod is brought near to a neutral, conducting sphere that is on top of an insulating stand, as shown in the diagram - Leaving Cert Physics - Question g - 2013
Question g
A positively-charged rod is brought near to a neutral, conducting sphere that is on top of an insulating stand, as shown in the diagram. How would a student charge t... show full transcript
Worked Solution & Example Answer:A positively-charged rod is brought near to a neutral, conducting sphere that is on top of an insulating stand, as shown in the diagram - Leaving Cert Physics - Question g - 2013
Step 1
earth the sphere
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Answer
To charge the sphere negatively by induction, the student first needs to connect the sphere to the ground. This allows electrons from the ground to move into the sphere, attracted by the positive charge of the nearby rod.
Step 2
remove earth (connection) and then remove rod
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Answer
After the sphere has gained a negative charge, the student should disconnect the grounding connection while the positively charged rod is still close. Then, the rod can be removed, leaving the sphere negatively charged.
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