Which of the following is an example of an unbalanced force? 1.A stroller being pushed
2.A chair leaning on the wall
3.A ball on the grass
4.A book sitting on a table

The modern-day generator works on the principle of electromagnetic induction discovered by michael faraday in 1831-32. faraday discovered that the above flow of electric charges could be induced by moving an electrical conductor, such as a wire that contains electric charges, in a magnetic field.

Amagnetic field "does not" interact with stationary electric charges. so, a.hope my answer you : )