Gravitational force of attraction between two objects can be calculated from the following formula:

Where m with subscript stands for mass of the object and r is the distance between them.
When we double the mass of those two objects, distance between them stays the same, while in the numerator we have:

When numerator in the second case 4 times greater than the 'original' numerator and denominator stays the same, force becomes 4 times greater.
Answer:
132 W
Explanation:
Efficiency = power out of generator / power into generator
0.6 = P / 220 W
P = 132 W
The ratio of the total charge on the charges, Q2/Q1 is; 9
<h3>Electric field and Total Charge</h3>
The electric field due to a charge is directly proportional to its magnitude and inversely proportional to the square of the distance to such point;
Since, E1 = E2, it follows that;
Where, d1 = 0.5 and d2 = 1.5
Q2/Q1 = 9.
Read more on electric fields;
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