Can a Positively Charged Insulating Rod Charge Two Metal Spheres Differently?

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Homework Statement



Expalin how a positively charged insulating rod can be used to give a metal sphere a positive charge. Cam the same rod be used to simultaneously give one sphere a psotive charge and another sphere a negative charge without the rod having to be recharged ??

Homework Equations



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The Attempt at a Solution



So I said charge a ball with contact by using the rod. Then, that ball will be - charged. Use the ball to charge the other ball by contact then we have a + charged ball ? Is it true ?

How about the second part, I am not really sure.
 
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Discussion

An insulating rod has no charges that are free to move around, so exactly how can it be used to give a metal sphere a positive charge? What do you know about charging by induction?