A ball of wool is rubbed against a ball made of a novel material X. Afterwards, when the ball of wool is brought near a negatively charged rod, the rod moves away from the ball of wool. Which of the following is true?
The novel material X has a greater electron affinity than wool.
Wool has a greater electron affinity than the charged rod.
Wool has a greater electron affinity than the novel material X.
The charged rod has a greater electron affinity than wool.
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