Q3. Three point-charges are shown below. q₁ = 3.0 μC, q2 = 4.0 μC, and q3 = -2.0 μC. di = 6.00 cm and d₂ = 4.00 cm. What is the magnitude of the net electric force on q2- the middle charge? 1.00 µC = 1.00×106C, 1.00 cm = 1.00×102 m. Use K = 9.00×10⁹ N-m²/C². A. Zero B. 5.0 N C. 15 N D. 30 N E. 45 N F. 60 N G. 75 N H. 90 N I. none of the above 91 A. 5 N, to the right B. 5N, to the left C. 10 N, to the right D. 10 N, to the left E. 20 N, to the right F. 20 N, to the left G. none of the above -d₂ 92 d₂- 93 Q4. A +2.0 µC charged particle is placed at point P. It experiences an electric force of 10.0 N to the right. The +2.0 µC charged particle is removed. Now a +4.0 μC charged particle is placed at point P. What's the electric force on the +4.0 µC charged particle?

Does it move counterclockwise, clockwise or its balanced, explain why

A higher level of hemoglobin in the blood increases blood density this is the basis for a simple test that can be used to see if a prospective blood donor has a high enough hemoglobin level to donate safely a drop of blood is placed in a copper sulfate solution and the time for the drop to sink to the bottom is measured. If this time is to long the hemoglobin level is to low explain how this test works according to physics

Explain how the innovation itself has changed over time