Important Points of Magnetic Effects Current

Important Points of Magnetic Effects Current

A freely suspended magnet always stays north–south.

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.

Class 10 Physics Magnetic Effect of Current