An object with mass m is located halfway between an object of mass M and an object of mass 3M that are separated by a distance d. What is the magnitude of the force on the object with mass m?A) 8GMm/d^2B) GMm/(4d^2)C) 4GMm/d^2D) GMm/(2d^2)E) 3GMm/2d^2

A) 8GMm/d^2

Explanation:

We are given that

Distance between m1 and m2=d

Distance of object of mass m from m1 and m2=d/2

Gravitational force formula

Using the formula

Force acting between m and M is given by

Force acting between m and 3M is given by

Now, net force acting on  object of mass is given by

Hence, the magnitude of the force on the object with mass m=

Option A is correct.

coil wire, increase current, put iron inside the coil

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.