Question

my brain is fried i don't even know

Answer 1

why a) ?

Answer 2

did you understand the question? :D..

first can u tell me if the two bodies would be like charges or opposite charges or do u think that doesn't matter?

Answer 3

this question is solved by method of discarding the wrong answers
\[we know electrostatic force \alpha qa*qb/r ^{2}\]
\[also, gravitational force \alpha ma*mb/r ^{2}\]
since force of gravity is attracting in nature, so for balanced(equilibrium) condition,electrostatic force must be of repulsion, hence like charges must be present
from above two equations: qa*qb/r ^{2}\]=ma*mb/r ^{2}\]
=> qa*qb=ma*mb .......(1)
for particles to accelerate towards each other, gravitational force must be greater than electrostatic force
so, in option (a), product of masses= (2*ma)*(2*mb)=4*ma*mb
from equation (1), qa*qb=ma*mb, so 4*ma*mb=4*qa*qb which is>qa*qb so, option (a) is correct
(also change in distance has no effect on the change of forces. )

Answer 4

@Mashy good question!

Answer 5

as you said both objects have the same (positive or negative) charges. so to make them accelerated toward each other, we must increase the gravitational force by some extent. This work can be done by doubling the masses of the bodies. So a) can be the answer.

Answer 6

thankyou :)
I was confused at first with this question because I thought that I had to consider if one of the charges were negative and the other one positive.
It makes sense now :D