Any kind of wave spreads out after passing through a small enough gap in a barrier. this phenomenon is known as

Diffraction

Explanation:

The phenomenon is known as diffraction. Diffraction has to do with bending of waves around corners. The type of corner or hole the waves passes through will determine the nature of the wave that will be produced after passage. For example, tiny round roles will produce a spherical waves, square shaped holes will produce rectangular form of waves and so on.

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

connect the batteries in series and hope