Introduction A coll wound around a wooden or glass core, or some other nonmagnetic substance for a core, will attract ferromagnetic materials just like an ordinary magnet when an clactric current i made to pass through it. if an iron nall is used as the core, the strength of the electromagnet can be increased Objective To study an electromagnet's behavior Materials 3 dry cells (15 V) magnet wire/copper wire long nail thumbtacks Procedure 1, Wind ten turns of magnet wire around the nail as shown in figure 1. 2. Connect one (1) dry cell to the ends of the called wire as shown in the fig. 2. 3. Close the loop and try to pick up some thumbtacks using the pointed end or head of the mail. Record how many you are able to pick up, (see fig. 3.) 4. Opon the circuit and observe what happens to the thumbtacks. 5. Repeat steps 1 to 4 with 20 turns of wire around the mall, 6. Count the number of thumbtacks you are able to pick up. Compare this number with that in step 3. 7. Connect three (3] dry cells in series with ends of the wires called 20 turns around the nall, (see fig. 4) 8. Close the loops and pick up thumbtacks, Count how many you are able to pick up and compare this with the previous results. Guide Questions 1. What happens when the nall (closed loop) is brought near the thumbtacks? 2. What is the effect of increasing the number of turns of the called wire around the nall, 3, What is the effect of increasing the number of dry cells of the coiled wire around the nall, 4. What happens to the thumbtacks when you open the loop/circuit? Explain why? 5. Write at least to ways on how to increase the strength of an electromagnet