Electric motor technology is a technology that contains at least one permanent magnet. therefore the correct option is B.
What is a magnetic field?
A magnetic field could be understood as an area around a magnet, magnetic material, or an electric charge in which magnetic force is exerted. The international system unit of the magnetic field is tesla.
An electric motor is a machine that transforms electrical energy into mechanical energy. Most electric motors function through the interaction between the motor's magnetic field and the electric current passing in a wire winding to produce force in the form of torque applicable on the motor's shaft.
The shaft rotation produced by the electrical motor is utilized in various day-to-day life applications such as electrical fan and other household machines.
Electric motor technology is a technology that contains at least one permanent magnet. therefore the correct option is B.
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