The electronegativity difference between carbon and hydrogen is small (0.4), but it is not zero. This means that the C-H bonds in cyclohexane are slightly polar, with the carbon atoms having a slight positive charge and the hydrogen atoms having a slight negative charge. However, the overall molecule of cyclohexane is nonpolar because the dipoles of the C-H bonds cancel each other out. This is because the C-H bonds are arranged in a symmetrical way around the carbon ring, so that the positive charges of the carbon atoms are balanced by the negative charges of the hydrogen atoms.

To understand why the C-H bonds in cyclohexane are arranged in a symmetrical way, you need to consider the geometry of the molecule. Cyclohexane is a ring-shaped molecule, with the carbon atoms arranged in a hexagon. The hydrogen atoms are attached to the carbon atoms in an alternating fashion, so that each carbon atom is bonded to two hydrogen atoms. This arrangement of the atoms creates a very symmetrical molecule, with the C-H bonds pointing in all directions.

The symmetry of the cyclohexane molecule is what causes the dipoles of the C-H bonds to cancel each other out. This is because the positive charges of the carbon atoms are evenly distributed around the ring, and the negative charges of the hydrogen atoms are also evenly distributed around the ring. This means that there is no net dipole moment for the molecule as a whole, and so cyclohexane is nonpolar.