The phenomenon of electromagnetic induction has been technologically exploited in many ways. An ...
0The phenomenon of electromagnetic induction has been technologically exploited in many ways. An exceptionally important application is the generation of alternating currents (ac). The modern ac generator with a typical output capacity of \( 100 \mathrm{MW} \) is a highly evolved machine. The Yugoslav inventor Nicola Tesla is credited with the development of the machine. One method to induce an emf or current in a loop is through a change in the loop's orientation or a change in its effective area. As the coil rotates in a magnetic field \( B \), the effective area of the loop (the face perpendicular to the field) is \( A \) \( \cos \theta \), where \( \theta \) is the angle between \( A \) and \( B \). This method of producing a flux change is the principle of operation of a simple ac generator.
An ac generator converts mechanical energy into electrical energy.
AC generator consists of a coil mounted on a rotor shaft. The axis of rotation of the coil is perpendicular to the direction of the magnetic field. The coil (called armature) is mechanically rotated in the uniform magnetic field by some external means. The rotation of the coil causes the magnetic flux through it to change, so an emf is induced in the coil. The ends of the coil are connected to an external circuit by means of slip rings and brushes.
Which of the following part in AC generator is mechanically rotated in the uniform magnetic field by some external means?
(A) Rotor
(B) Armature
(C) Shaft
(D) None of these
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