Assessment A. Read the questions carefully and choose the best answer. Write onty the letters of your answers on another sheet of paper, 1. The material produced by making electricity flow through a coil of wire wound around an iron nail A circuit B. battery C. current D. electromagnet 2. The variable that does NOT affect the magnetism of an electromagnet A. magnet B. size of the nail C. number of coils D. number of batteries 3. What device converts electrical energy from a battery to make the toy move? A motor B. generator C. galvanometer D. circuit breaker 4. Which of the following electromagnets has the strongest magnetism? A. Electromagnet with 10 coils of wire B. Electromagnet with 15 coils of wire C. Electromagnet with 20 coils of wire D. Electromagnet with 25 coils of wire​