1 through 5 please and thank you so much

1. Determine the electrostatic force acting between a +3.0 uC charge and a +7.5 JC charge, if they are placed 16 cm apart. 2 marks 2. A metal sphere has a net charge of -4.00 C. How many excess electrons does the metal sphere contain? 2. 2 marks 3. Three point charges are arranged as shown below. 0.18 m 0.16 m -25 UC -65 UC +42 JC What is the net magnitude and direction of the electrical force acting on the +42 uC charge? 4 . Calculate the magnitude of the net electrostatic force acting on the 28 uC due to the other two charges shown. Assume that, relative to the 35 uC charge, the other two charges are positioned at right angles to each other. 5. An electron is placed 1.0 x 105 m away from a particle containing several protons. It experiences an attractive force of 6.9 x 10-22 N at this position. a) What is the size of charge contained in the particle? a) 2 marks b) Determine the magnitude of the particle's field strength at the electron's position. Assume the electron is removed from this location. b ) 2 marks c) How many protons are contained in this particle? C) 2 marks d) If the electron is now placed three times farther away from the particle than its original position, what will be the new force of attraction between them