(a) when we rub a plastic rod witha piece of fur, from the in the result charging fur with and plastic rod .

Explanation:

When the two dissimilar bodies rubbed together, they the both of the bodies becomes charged. One of the body gets positive charge and the other body gets negative charge.

the positively charged body loses some electrons and the negatively charged body gains some electrons.

According to the properties of charge when the plastic rod is rubbed with the fur, the plastic rod has a tendency to get the negative charge and the fur has a tendency to get positive charge.

So,

When we rub a plastic rod with a piece of fur, electronstransfer from furto the plastic. In the result charging fur with -positivecharge and plastic rod withnegativecharge.