Which of the following things will make an electromagnet stronger? (Check all that apply) O Increase the current.
O Decrease the number of coils.
O Add a wooden cylinder to the core.
O Decrease the current.
Add an iron cylinder to the core.
O Increase the number of coils.

Aman is trying to drag a small tree that he cut down. if the static coefficient of friction of the tree on the ground is 0.5 and the tree weighs 670 n, what is the minimum amount of horizontal force that the man will need to apply so that the tree will start moving? o a. 465 n o b. 230 n o c. 670 n o d. 335 n