What is the net charge on a sphere that has the following? a) 5.31e106 electrons and 7.15e106 protons. b) 245 electrons and 113 protons.

As shown below, an alpha particle (m = 6.642 × 10-27 kg, q = +2e) is shot upward with an initial speed of v; = 3.50 x 105 m/s from one large plate of charge toward another large plate of 8. charge. Each plate has a charge density given below. Assume gravity is negligible. а. Find the speed of the alpha particle once it hits the positively charged plate. b. Which plate is at the higher potential, the top plate or the bottom plate? Explain using physical reasonng. 02 = +2.50 µC/m² 2.00 mm V; = 3.50 × 10° m/s 01 = +4.50 µC/m²

IP A particle with a mass of 4.0 g and a charge of +5.0x10-2 μC is released from rest at point A in the figure (Figure 1). Figure Ag 3.0 cm во 5.0 cm 4.0 cm OC E 1 of 1 L X > In which direction will this charge move? Positive Y- direction Negative y- direction Negative x-direction Positive x-direction Submit Part B V= Request Answer What speed will it have after moving through a distance of 5.5 cm ? The electric field has a magnitude of 1600 N/C Express your answer using two significant figures. 15. ΑΣΦ SFR P Pearson ? m/s

1. In the following problems, you don't need to understand the physics to complete the questions. Focus on the equations. (a) The force of gravity, F, between two masses, m and M, separated by a distance r, is given by GmM where G is a constant. Write an equation of r in terms of other variables in the equation F= for F: r= GmM F (b) The electric force between two charges q=3-10-6 units and Q=-4·10¯6 units separated by a distance, d = 3.10-4 units, is given by F= kqQ d² I where k=9. 10⁹ units. Without using a calculator, calculate the F. F= -12x10 -5 Ⓡ√