02.24: Two small hollow metal spheres hung on insulating
;iwv+6)mwvo r a m)so;threads attract one another as shown. It is known that a positively charged rod will attract
w)v;s a;owmmv6i ro) + 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?