It becomes electrically charged. It becomes an electrical insulator. It becomes temporarily magnetized. It becomes permanently magnetized. 88. William is constructing an electric motor. What does he observe about the current flow while constructing the motor? The current in the coil reverses every full turn. The current in the coil reverses every half turn. The current in the coil is moving in a clockwise direction. The current in the coil is moving in an anticlockwise direction. 89. A stereo speaker vibrates in and out because it is attached to an electromagnet that is moving in and out. The electromagnet is alternately attracted to and repelled from a permanent magnet. What causes the electromagnet to be first repelled from and then attracted to a permanent magnet? The of the permanent magnet reverse. The permanent magnet is affected by an electrical field. The electrical field of the electromagnet changes strength. The electrical current to the electromagnet changes direction. 90. Permanent magnets are used in generators to induce current in a coil. What determines the direction of the induced current? movement of the magnet strength of the magnet size of the magnet type of the magnet 91. Which type of wave can transmit energy in a vacuum? light water sound seismic 92. The rays listed below are arranged in increasing order of their energies. infrared rays, visible rays, ultraviolet rays, gamma rays Which rays will have the lowest frequency? infrared rays visible rays ultraviolet rays gamma rays
It becomes electrically charged. It becomes an electrical insulator. It becomes temporarily magnetized. It becomes permanently magnetized. 88. William is constructing an electric motor. What does he observe about the current flow while constructing the motor? The current in the coil reverses every full turn. The current in the coil reverses every half turn. The current in the coil is moving in a clockwise direction. The current in the coil is moving in an anticlockwise direction. 89. A stereo speaker vibrates in and out because it is attached to an electromagnet that is moving in and out. The electromagnet is alternately attracted to and repelled from a permanent magnet. What causes the electromagnet to be first repelled from and then attracted to a permanent magnet? The of the permanent magnet reverse. The permanent magnet is affected by an electrical field. The electrical field of the electromagnet changes strength. The electrical current to the electromagnet changes direction. 90. Permanent magnets are used in generators to induce current in a coil. What determines the direction of the induced current? movement of the magnet strength of the magnet size of the magnet type of the magnet 91. Which type of wave can transmit energy in a vacuum? light water sound seismic 92. The rays listed below are arranged in increasing order of their energies. infrared rays, visible rays, ultraviolet rays, gamma rays Which rays will have the lowest frequency? infrared rays visible rays ultraviolet rays gamma rays
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