A point charge q1 = 4.00 nC is placed at the origin, and a second point charge q2 = -3.05 nC is placed on the x-axis at x =+ 21.0 cm. A third point charge q3 = 2.10 nC is to be placed on the x-axis between q1 and q2. (Take as zero the potential energy of the three charges when they are infinitely far apart.)

Part A:What is the potential energy of the system of the three charges if q3 is placed at x = + 10.0 cm?
Part B:Where should q3 be placed between q1 and q2 to make the potential energy of the system equal to zero?

Acyclotron is used to produce a beam of high-energy deuterons that then collide with a target to produce radioactive isotopes for a medical procedure. deuterons are nuclei of deuterium, an isotope of hydrogen, consisting of one neutron and one proton, with total mass 3.34×10−27kg. the deuterons exit the cyclotron with a kinetic energy of 6.40 mev .a-what is the speed of the deuterons when they exit? b-if the magnetic field inside the cyclotron is 1.25 t, what is the diameter of the deuterons' largest orbit, just before they exit? c-if the beam current is 350 μa how many deuterons strike the target each second?

Ivana walks 2km north then turns around and walks 3km south

Which of the following characteristics is fixed, or definite, for all states of matter?