What is one way the internet has made our lives better? * A. Our photos can become memes.
B. Employers can find out all about us.
C. Staying in touch is easier.
D. People can share our photos without asking.

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?

Convection currents are caused by differences in what two things?

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?