There is a potential difference of 12 v across a resistor with 0.25 a of current in it. the resistance of the resistor is?

Explanation:

The resistance of the resistor can be calculated by using Ohm's law:

where

V is potential difference across the resistor

I is the current through the resistor

R is the resistance

In this problem, we have

So we can re-arrange Ohm's law to calculate the value of the resistance of the resistor:

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.