EARTH SCIENCE
MAGNETISM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A static magnetic field produces alternating current
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An electromagnetic field converts electrical energy to magnetic energy.
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A moving magnetic field generates an electrical current.
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An unstable electric field produces electrical sparks.
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Detailed explanation-1: -Answer: D. A moving magnetic field generates an electrical current.
Detailed explanation-2: -Magnetic fields can be used to make electricity Moving a magnet around a coil of wire, or moving a coil of wire around a magnet, pushes the electrons in the wire and creates an electrical current. Electricity generators essentially convert kinetic energy (the energy of motion) into electrical energy.
Detailed explanation-3: -The force of the fluid on the blades spins/rotates the rotor shaft of a generator. The generator, in turn, converts the mechanical (kinetic) energy of the rotor to electrical energy. Different types of turbines include steam turbines, combustion (gas) turbines, hydroelectric turbines, and wind turbines.
Detailed explanation-4: -In a gas-powered generator, an internal combustion engine provides the mechanical force needed to generate a current. The engine spins a shaft which rotates an electromagnet (armature). The rotating armature spins inside a stationary magnetic field (stator) to produce electrical current through copper wiring.
Detailed explanation-5: -Faraday’s law of induction describes how an electric current produces a magnetic field and, conversely, how a changing magnetic field generates an electric current in a conductor.