How will the gravitational force between two objects change if they are moved to twice their original distance from each other A 2 times more force
B 4 times more force
C 1/2 of the force
D 1/4 of the force

The gravitational force between two bodies of mass M and m, separated by a distance r, has a magnitude F given by the universal law of gravitation,

F = G M m / r ²

where G is the universal gravitation constant (whose value is unimportant for this question).

If you double the distance r, then the new force has magnitude

G M m / (2r ) ² = 1/4 • G M m / r ²

i.e. 1/4 of the original force's magnitude. So the answer is D.

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.

volume: 22

density: 7.04