An alpha particle has a mass of 6.64 x 10^-27 kg and a charge of +2e (where e is the charge of an electron). What are the magnitude and direction of the electric field that will balance the gravitational force on the particle?

Question

anonymous · Answer

$$Fe= qE = mg$$
so $$E= \frac{ mg }{ q }$$

and you can substitute and solve it easily

anonymous · Answer

for balancing F should act upward

abhisar · Answer

yes !
take q = 2e$^-$ and find the value of E (electric field)