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The neutral identical aluminium spheres A and B are hanged freely such that they are in contact, as shown in the figure. A negatively charged rod is brought close to the spheres as shown.
negative charge brought close to spheres
One of the spheres B is earthed momentarily by touching with finger and then the rod is withdrawn. State and explain the observation made. 

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  1. The spheres will repel
  2. Both are charged positively by induction
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