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Question
A flat coil ABCD is freely suspended between the pole pieces of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field. Name an instrument which makes use of the principle stated above.
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Solution
The correct option is B d.c. motor
The direct current (DC) motor is one of the first machines devised to converts electrical power into mechanical power.
Permanent magnet (PM) direct current converts electrical energy into mechanical energy through the interaction of two magnetic fields. One field is produced by a permanent magnet assembly; the other field is produced by an electrical current flowing in the rectangular coil ABCD, through the brushes and split-ring commutators. These two fields result in a torque which tends to rotate the coil. As the coil turns, the current in the winding is commutated to produce a continuous torque output. Hence, the DC motor is a device which works on the above principle.
The direct current (DC) motor is one of the first machines devised to converts electrical power into mechanical power.
Permanent magnet (PM) direct current converts electrical energy into mechanical energy through the interaction of two magnetic fields. One field is produced by a permanent magnet assembly; the other field is produced by an electrical current flowing in the rectangular coil ABCD, through the brushes and split-ring commutators. These two fields result in a torque which tends to rotate the coil. As the coil turns, the current in the winding is commutated to produce a continuous torque output. Hence, the DC motor is a device which works on the above principle.
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