1) What is the shape of magnetic field lines around a wire? a) Circular b) Linear c) Elliptical d) Random 2) What happens to electric field strength as distance increases? a) Decreases b) Increases c) Remains constant d) Oscillates 3) What is an electromagnet? a) Permanent magnet b) Temporary magnet c) Natural magnet d) Magnetic rock 4) What is needed to create an electromagnet? a) Copper wire b) Plastic rod c) Wooden stick d) Glass tube 5) Which part of an electromagnet can be turned on and off? a) Magnetic field b) Metal core c) Copper wire d) Battery 6) What happens when the current stops flowing in an electromagnet? a) Loses magnetism b) Becomes stronger c) Changes color d) Heats up 7) Which material is commonly used as the core of an electromagnet? a) Iron b) Plastic c) Wood d) Glass 8) What is the main function of an electric generator? a) Convert mechanical to electrical energy b) Convert electrical to mechanical energy c) Store electrical energy d) Measure electrical energy 9) Which component is essential in both motors and generators? a) Rotor b) Stator c) Battery d) Switch 10) What is the primary role of an electric motor? a) Convert electrical to mechanical energy b) Convert mechanical to electrical energy c) Store mechanical energy d) Measure mechanical energy 11) The Sun has more gravity than the planets in our solar system because the Sun is a) hotter b) more massive c) made of plasma d) undergoing fusion 12) The strength of gravity is affected by these factors. They are a) mass and distance b) mass only c) distance only d) mass and weight 13) A group of students is investigating the different factors that affect the strength of an electric motor. A diagram of the motor is shown. a) Reduce the size of the axle running through the center of the motor. b) Increase the number of coils of wire within the two sections of the motor. c) Decrease the voltage of the power source being used to operate the motor. d) Place the permanent magnets and coils of wire farther apart inside the motor. 14) A magnet has two poles, a North and South. What happens when two magnet's South poles are placed near each other? a) They attract b) They move sideways c) They do nothing d) They repel each other 15) Where is the force the strongest on a magnet? a) The Force is the same all over the magnet b) At the Poles c) On the Front d) On the back

Magnetic & Electric Fields

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