Gravity is an internal force
Answer:
ii. Same
Explanation:
Electrostatic potential V=kQq/r
When the test charge is brought to a point A at a distance r and a net charge of +Q
i.e At point A
q₁ = q
r₁= r
V=kQq/r
At the point B, When q₂ = 2q and
r₂= 2r
V=kQ * 2q/2r
The two in the numerator and the denominator cancel to give V=kQq/r which is equal to the potential at A
The index of refraction of a material is the ratio between the speed of light in vacuum and the speed of light in that material:
where
n is the refractive index
is the speed of light in vacuum
v is the speed of light in the material
For sapphire, n=1.76, so if we re-arrange the previous equation and we use this value, we can calculate the speed of light in sapphire:
All what ? There's nothing to check, so there's nothing that applies.
The only things that affect the force of gravity between objects is the product of <em>their masses</em>, and the <em>distance and direction</em> between their centers. That's IT. Nothing else has any effect. Not even a steel, concrete, and Kryptonite wall between them.