Important Points of Magnetic Effects Current
⇒ The region around a magnet in which its magnetic force can be detected is called the magnetic field.
⇒ The magnetic field is represented by magnetic field lines.
⇒ The tangent at any point of a magnetic field line represents the direction of the magnetic field at the point.
⇒ The number of lines of force passing through a unit area represents the strength of the field. If the lines of force are closer, the magnetic field is stronger.
⇒ The magnetic field lines around a current–carrying straight conductor are concentric circles around the conductor.
⇒ The direction of the magnetic field due to a current–carrying straight conductor is given by Fleming’s right–hand rule.
⇒ The magnetic field due to a current–carrying solenoid is similar to that of a bar magnet. The magnetic field inside a solenoid is nearly uniform and is parallel to the axis of the solenoid.
⇒ A magnet formed due to the magnetic field of a current is called an electromagnet. An electromagnet essentially consists of a soft iron core wrapped around with an insulated copper wire coil.
⇒ An electric motor is a device that converts electrical energy into mechanical energy. It is based on the principle that: When a current-carrying coil is placed in a magnetic field, a torque acts on it.
⇒ When a conductor moves perpendicular to a magnetic field, an emf is induced across its ends. The direction of induced emf or the induced current is determined by Fleming’s right–hand rule.
⇒ The generator is based on the principle of the electromagnetic field, with a continuous change in flux due to which an emf is induced.
⇒ Power is transmitted from the power station to cities at high voltage and low current to minimize power loss.
What is a Fuse?
A fuse is a wire of high resistance and made up of a material of low melting point.