Suppose a negatively charged object A is brought in contact with an uncharged object B in a closed system. What type of charge will be left on object B? a. negative
b. positive
c. neutral
d. cannot be determined

b. positive

Explanation:

A negatively charged object A has excess electron while uncharged object B is neutral, i.e equal number of electrons and protons.

When the negatively charged object A is brought in contact with the neutral object B, the electrons present in object B will be repelled (likes charges repel). This process will leave object B with excess protons, thus object B will positively charged.

The correct option is "B"

+15-35=-20

going in opposite directions