Electromagnetic Effect of a Current

• Magnetic field around a current carrying wire

• Magnetic field around a current carrying solenoid

• Increasing the strength of the field

• Increasing the current increases the strength of the field

• Increasing the number of turns of a coil increases the strength increases the strength of the field.

• Reversing the current direction reverses the magnetic field direction (right-hand rule).

• The direction of a magnetic field line at a point is the direction of the force on the N pole of a magnet at that point

• Magnetic effect of current is used in a relay and a circuit breaker.