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प्रश्न
Explain the principle, construction and working of a dc motor.
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उत्तर
A motor is an electrical machine which converts electrical energy into mechanical energy. The principle of working of a DC motor according to Faraday’s laws of electromagnetic induction is that “whenever a current carrying conductor is placed in a magnetic field, it experiences a mechanical force”. The various parts of a DC motor are; Permanent magnets on both sides of a coil which consists of carbon brush and commutator as shown in
Working of electric motor is primarily dependent upon the interaction between magnetic field and current. The direction of this force is given by Fleming’s left hand rule and it’s magnitude is given by F = BIL. Where, B = magnetic flux density, I = current and L = length of the conductor within the magnetic field.
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संबंधित प्रश्न
- How would you demonstrate that a momentary current can be obtained by the suitable use of a magnet, a coil of wire and a galvanometer?
- What is the source of energy associated with the current obtained in part (a)?
Magnetic flux passing through a coil is initially 6 x 10-4 Wb. It reduces to 10 % of its original value in 't' second. If the e.m.f. induced is 0.54 mV then 't' in second is ____________.
A magnet is moved towards a coil (i) quickly (ii) slowly. The induced potential difference.
The direction of the magnetic field around a straight conductor carrying current can be determined by ______.
Define the right-hand thumb rule.
Name the principle of AC generator.
What does Faraday’s First Law or Neumann’s law state about the magnitude of induced emf?
What is the induced emf if both a magnet and a coil remain stationary?
What interaction opposes a north pole moving away from the near face of a coil?
Why must work be done to move a magnet towards or away from a coil when an induced current flows?
