Why does ebonite always acquire negative charge when rubbed with any other substance?

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Solution

If any two substances in this list are rubbed against one another, the one higher in the order gets positively charged.
And the other will get a negative charge due to its low frictional order
Ebonite when rubbed with any other substance acquires a negative charge because ebonite has the lowest frictional order.
Hence, ebonite always acquires a negative charge when rubbed with any other substance

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