Question

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?

Answer 1

\[Fe= qE = mg\]
so \[E= \frac{ mg }{ q }\]

and you can substitute and solve it easily

Answer 2

for balancing F should act upward

Answer 3

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