What I Know A. Choose the letter of the correct answer. Write your answers on a separate sheet of paper. 1. Amagnet is A, a wooden figure B, a magnetic force C. an object that allows light to pass through D. an object that attracts or pulls certain materials like iron and steel
2. To strengthen an electromagnet, there is a need to A. decrease the voltage B. increase the number of turns in a coil C. put a non-magnetic substance in the coil D. all of the above
3. Which part of electromagnet supplies electric current? A. battery C. switch B. nail D. wire
4. Which is an example of a temporary magnet? A, bar magnet C. horseshoe magnet B, electromagnet D. magnetite
5.Which from the following materials can be used as a core in making an electromagnet a.plastic ruler b.plastic straw c.screw driver d.wood stick
