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27. It is considered as a temporary magnet. a. electromagnet b. magnet c. circuit d. source

28. Electromagnet can be used in the following appliances except one. a. Electric fan b. doorbell c. television d. lampshade

29. To strengthen an electromagnet, one must a. decrease the voltage c. put a magnetic substance in the coil b. increase the number of cell/battery attached d. remove one of the nails from the coils​