Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?
Two charged balloons repel each other.
This is because the sign of charge on the two balloons must be same.
Like charges repel each other, and hence the two balloons repel each other.
When a charged body is brought near an uncharged body, the uncharged body acquires a charge opposite to that of the charged body by induction.
Hence, when a charged balloon is brought near an uncharged balloon, they attract each other