Draw a well labelled diagram of electric generator.

The device which is used to convert mechanical energy into electrical energy is called an electric generator. It works on the principle that when a straight conductor is moved in a magnetic field, then current is induced in the conductor. The following diagram represents an electric generator. Armature, slip rings, brushes and permanent magnets are the parts of an electric generator.

Draw a well labelled diagram of electric motor.

An electric motor is a device that converts electrical energy into mechanical energy. The motor works when current passed through it rotates the shaft continuously to drive different types of machines in homes and industries. The electric motor is used in electric fans, washing machines, refrigerators, mixer- grinder etc. The following diagram represents an electric motor. Battery, strong field magnet, armature coil, split ring or commutator, carbon brushes are the parts of an electric motor.

State Fleming’s left-hand rule.

According to Fleming’s left-hand rule, stretch the thumb, forefinger and middle finger of our left hand such that they are mutually perpendicular to each other. If the first finger points in the direction of the magnetic field and the second finger in the direction of the current, then the thumb will point in the direction of motion or the force acting on the conductor. In other words, according to Fleming’s left-hand rule, stretch the forefinger, the centre finger and the thumb of our left hand at right angles to one another. Adjust our hand in such a way that the forefinger points in the direction of the magnetic field and the centre finger points in the direction of current in the conductor, then the thumb shows the direction of motion of the conductor.

Write any three properties of magnetic field lines.

The following are the three properties of magnetic field lines: 1) The direction of magnetic field lines outside the magnet is from north pole to south pole and the direction of lines inside the magnet is from south pole to the north pole 2) The magnetic field lines are crowded (i.e. close to each other) near the pole where the magnetic field is strong. On the other hand, magnetic field lines are far away at other places where the magnetic field is weak 3) The magnetic field lines are closed continuous curves

Draw a well labelled diagram of electric motor.

An electric motor is a device that converts electrical energy into mechanical energy. The motor works when current passed through it rotates the shaft continuously to drive different types of machines in homes and industries. The following diagram represents an electric motor. Battery, strong field magnet, armature coil, split ring or commutator, carbon brushes are the parts of an electric motor.