Me
compare and contrast electromagentic and gravitational force. you need to provide two ways that they are alike and two ways that they are different.

Explanation:

Electromagnetic and gravitational forces have equations that clearly describe them.

Electromagnetic      Fe = K q₁ q₂ / r²

Gravitational            Fg = G m₁ m₂ / r²

Analyzing these expressions a bit we can see some things in which they are EQUAL:

    • They depend on the inverse of the squared distance

    • They are long range, they become zero In the infinite

    • They are proportional to a system constant, in one case the charge and in the other the mass

We can also observe some DIFFERENCES:

     • Gravitational always attractive, the electric can be attractive or repulsive depending on the charge

    • When we calculate their magnitudes the electric force in 10 40 times greater than the gravitational

    * The electric force can be zero if the charge is zero, the gravitational force can never be zero

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it