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Magnetic Effect of An Electric Current.
The direction of the magnetic field is dependent on the direction of the current. The direction of the lines of force can be determined using a simple rule called the right-hand screw rule.
This rule states that “if a right-hand screw advances in the direction of the current , then the rotation of the screw is in the direction of the field”.
- Another rule is the right-hand grip rule which states that “if the wire carrying a current is gripped with the right hand, using the thumb along the conductor and pointing in the direction of the current, then the direction of curled fingers is in the direction of the lines of force”.
Magnetic field due to a solenoid. The rule for polarity.
A solenoid is a cylindrical coil of wire acting as a magnet when carrying electric current.
The direction of the field can be determined using a simple rule stated as follows “if the coil (solenoid) is viewed from one end and the current flows in an anticlockwise direction at that end, then that end is the North Pole.
If the current flows in a clockwise direction, then that end is the South Pole”.