A test charge of 5 µC is placed halfway between a charge of 10 µC and 15 µC separated by 5 cm. What is the magnitude of the net force on test charge? a.
720 N

b.
-360 N

c.
1080 N

d.
360 N

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct