The sphere of an uncharged electrometer was held with an ebony stick electrified by friction against wool. What sign of charge

The sphere of an uncharged electrometer was held with an ebony stick electrified by friction against wool. What sign of charge was formed on the sphere of the electrometer, its rod and arrow? Explain the mechanism of their electrification

Electrons from a negatively charged ebonite rod are transferred to the sphere of the electroscope, the rod and the arrow.

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