What is the net force when forces applied are 300 N to the right and 100 N to the right

400 Newtons to the right.

Explanation:

You have 300 Newtons that are being applied to the right and you also 100 Newtons to the right. When calculating net force with the forces that go the same direction, you add them. 300 plus 100 is 400. Therefore, it is 400 Newtons or N to the right. Hope this helps!

wavelength variability is the right one

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6