When do sunspots disappear? A) Sunspots are always present and NEVER disappear.

B) Once the magnetic field weakens in the area and cold plasma enters the area of the sunspot

C) Once the magnetic field weakens in the area and hotter plasma enters the area of the sunspot

D) Once the magnetic field strengthens in the area and hotter plasma enters the area of the sunspot

If the speed of a particle triples ,by what factor does its kinetic energy increase?

What are the north and south poles of a solenoid change with?

Consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? a)\vec ein the +xdirection,\vec bin the +ydirection. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction b)\vec ein the -y direction,\vec bin the +x choose+ x direction- x direction+ y direction- y direction+ z direction- z direction c)\vec ein the +z direction,\vec bin the -x direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction d)\vec ein the +y direction,\vec bin the -z direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction