02.24: Two small hollow metal spheres hung on insulating thread
d7-m11eaxh ve7d7; gkh7ltz/m v w(cls attract one another as shown.
m(l z h7h l1extwdv/emv;7dg1c77 a-k It is known that a positively charged rod will attract ball A.
I. Ball A has a positive charge
II. Ball B has a negative charge
III. Ball A and Ball B have opposite charges
Which of the above can be correctly concluded about the charge on the balls?