Charging Never Makes Charge. It Moves Electrons

You'll learnwhere the charge comes from when you charge something: it moves, and it is never made.

A rod and a piece of fur, both neutral, are rubbed together. Afterwards the rod reads −4.0 nC and the fur +4.0 nC. Where did that charge come from? Twelve short steps; press Next for each one.

12 STEPS · 6 QUICK CHECKS · MOVED, NEVER MADE · WHOLE STEPS OF e · THE MATERIAL DECIDES · v2

charge moves between the bars · the total never leaves zero

Before you start

What you're looking at

Two bars of material. Inside each, a pink dot is 1 nC of positive charge and a blue dot is 1 nC of negative charge.

The question

After rubbing, one bar reads −4.0 nC. Where did that charge come from?

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