What must be the height of water column that the atmospheric pressure can support in water barometer? [Density of water = 1000 kg/m', g = 9.8 m/s2, 1 atm = 1.01 10% N/m²].​

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.