An electron moves in a circular path in a region of space filled with a uniform magnetic field B= 0.4 T. To double the radius of the electron's path, the magnitude of the magnetic field must become:

a. 0.8T
b. 0.2T
c. 0.1T
d. 0.3T
e. zero

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods