Which of the following is NOT true about energy? A. it knocks down bowling pins
B. you can hold it in your hand
C. it moves wind turbines
D. it makes a baseball fly

Answerapplying a direct current to a non magnetic material in order to create a electromagnetic field; plz check first good luck;

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other