Question

Magnetic effect of electric current neet notes

Answer 1

Answer:

• Magnetic field, Field lines, Field due to a current carrying conductor, Field due to current carrying coil or solenoid; Force on current carrying conductor, Fleming’s left hand rule. Electromagnetic induction. Induced potential difference, Induced current, Fleming’s Right Hand Rule, Direct current. Alternating current; frequency of AC. Advantage of AC over DC. Domestic electric circuits.
• Facts that Matter
• Magnet has two poles, North pole and South pole. Like poles repel and unlike poles attract.
• Magnetic field: The region around a magnet in which the force of attraction or repulsion produced by magnet can be detected.
• Magnetic field around a straight current carrying conductor:
• Magnetic field produced by a conductor at a distance ‘r’ in vacuum is
• •  Proportional to current (I).
• •  Inversely proportional to the distance ‘r’.
• Direction of field is given by Right Hand Thumb Rule
• Magnetic field due to current carrying wire through a circular loop:
• Magnetic lines of force are circular near the wire and become parallel at the middle point ‘M’ of the coil
• Magnetic field produced at the centre is
•          •  Proportion al to the current I
•          •  Inversely proportional to the radius ‘r’
• Properties of magnetic field lines:
•          •  They do not intersect each other.
•          •  The direction of the magnetic field lines is from south to north.
•          •  The direction of the magnetic field lines inside the magnet is from North to South.
• Magnetic field due to current flowing in solenoid:
• •  Solenoid: Long coil of many turns of insulated copper wire wrapped in the shape of a cylinder.
• •  Magnetic field produced by a solenoid similar to bar magnet.
• •  Strength of magnetic field is proportional to number of turns and magnitude of current.
• Electromagnets: An electromagnet consists of a long coil of insulated copper wire wound on a soft iron core.
• Electric Motor
• •  A device that converts electrical energy to mechanical energy.
• •  Principle: When rectangular coil is placed in magnetic field and current is passed through it coils experience a torque, which rotates it continuously.
• Electromagnetic Induction
• •  Phenomenon of inducing an electric current in a coil by changing magi tic field around it.
• •  Direction of induced current by Fleming right hand rule (MR):
•     Forefinger          - magnetic field
•     Center finger     - induced current
•     Thumb                - motion of conductor
• Electric Generator
• •  Converts mechanical energy into electrical energy.
• •  AC GENERATOR: Produce current which changes direction after equal interval of time.
• •  DC GENERATOR: Produce current which is unidirectional.

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