Magnetic Effect of Electric Current and Light
- Properties of Magnetic field lines
- Originate from the North pole and end at the South pole [outside the magnet]
- They are closed continuous lines
- Density of the lines increases near the poles and decreases away from the poles
- Lines never cross each other
- Like poles repel and unlike poles attract each other.
- The region where magnetic field lines are crowded has relatively greater strength
- The magnetic poles of the Earth continuously change their position with time i.e., the magnetic North Pole becomes the magnetic South Pole and vice-versa. This phenomenon of flipping of poles is known as magnetic reversal.
- The angle of the horizontal plane between the geographic North (true North) and the magnetic North is known as magnetic declination.
- Deflection of compass
- Right-hand thumb rule
- A cylindrical coil having many turns of insulated wires wrapped closely
- Right-hand thumb rule/ Maxwell’s corkscrew rule
- If one holds a current-currying wire in the right hand such that the thumb is pointing in the direction of the current, then the direction in which the other finger encircles the wire will…
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