
To explain: The effect observed when the charging rod is moved away before the ground is removed from the knob.

Explanation of Solution
Introduction:
The uncharged
An electroscope is charged by induction. If the charging rod is moved away, before removing the ground from the knob, then the charges (that transferred from the electroscope into the ground) will flow back to the electroscope from the ground. Hence the electroscope remains neutral.
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Glencoe Physics: Principles and Problems, Student Edition
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