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

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A positively charged insulating rod can charge a metal sphere positively through direct contact, transferring some of its charge. However, it cannot simultaneously charge one sphere positively and another negatively without being recharged, as the insulating rod does not allow free movement of charges. The concept of charging by induction suggests that a charged object can influence the distribution of charges in a nearby conductor, but this method requires separation of charges rather than direct contact. The discussion highlights confusion regarding the mechanics of charging and the role of insulating materials. Understanding these principles is essential for accurately answering the posed questions.
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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 ??

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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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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?
 

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