Two identical cubes carry identical positive charge. Static friction between the cubes and the level surface they sit on just barely keeps them at rest. Then they are placed closer together on a different level surface, and they are barely at rest due to static friction. Is the coefficient of static friction between a cube and the second surface higher or lower than on the first? Explain. 1. The coefficient is higher. The attractive force between the cubes is greater when they are closer, and the force due to friction must also be greater to keep the cubes from sliding toward each other.2. The coefficient is higher. The repulsive force between the cubes is greater when they are closer, and the force due to friction must also be greater to keep the cubes from sliding away from each other.3. The coefficient is lower. The repulsive force between the cubes is greater when they are closer, and the force due to friction must also be greater to keep the cubes from sliding away from each other. The frictional force is inversely proportional to the coefficient of friction, so the coefficient is lower.4. The coefficient is lower. The repulsive force between the cubes is weaker when they are closer, and the force due to friction must also be weaker to keep the cubes from sliding away from each other.