What is the direction of the magnetic force on a positive charge if: 1. V= downward; B= out of the page

2. V=upward; B=right

3. V=right; B=into the page

4. V=into the page; B=upward

5. V=out of the page; B=left

What is the single most important equation in all of physics?

Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. these cyclotrons typically accelerate h- (the hydride ion, which has one proton and two electrons) to an energy of 5 mev to 20 mev. this ion has a mass very close to that of a proton because the electron mass is negligible—about 1 2000 of the proton’s mass. a typical magnetic field in such cyclotrons is 1.9 t. (a) what is the speed of a 5.0-mev h-? (b) if the h- has energy 5.0 mev and b = 1.9 t, what is the radius of this ion’s circular orbit?

Which of the following is probably the least necessary character trait needed to be a good clinical nurse?