As we know that when charge is released in electric field
It will have two forces on it
1. electrostatic force
2. gravitational force
now if the ball will accelerate upwards so we can say
net upward force = mass * acceleration
now we can find charge q on it by above equation
So above is the charge on the particle
Answer:6g/cm³
Explanation:density=mass/volume
D=30/5
Density of marble=6g/cm³
Wind farms, solar collectors, and nuclear power plants generate no pollution.
But wind farms make noise, wind and solar are both hazardous to birds, and there's no known means of disposing of nuclear plant waste that's completely safe.
The Answer Is B (: because if it was closed no light could get throw and its not d because air doesnt circulate throw water xD HOPE THIS HELPS ANSWER IS REALLY B ♥