Select the statement that correctly describes how light travels? light can travel in a vacuum, and its speed is constant even if
the light source is moving. light can travel in a vacuum and willtravel slower if the light source is moving in the same direction. light can travel in a vacuum, and it travels faster if the light source is stationary. light travels only through a medium, it travels faster if the light source is stationary.
some common devices that use current carrying conductors and magnetic fields are electric motor electric generator loudspeakers microphones and measuring instruments like galvanometer ammeter and voltmeter
