working of electic motor for 5 marks .
CLASS X
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Answers
When an electric current is passed through the rectangular coil current produces a magnetic field around the coil. The magentic field of the magnet interacts with the magnetic field of current carrying coil and causes the coil to rotate continuously.
When ABCD is moved in the horizontal position , current from the battery enters the coil through brush P and commutator half-ring X. The current flows in the direction ABCD and leaves through the ring Y and brush Q.
In the side AB of the coil , current moves up and in CD current moves down.
According to Flemming's Left Hand Rule , force on side AB of the coil is in downward direction and in CD upward direction.
After half rotation CD comes on left side and AB on right side. The commutator half ring contacts with the other brush. This reverses the direction of current in the coil which in turn reverses the direction force AB and CD of the coil.Due to this Cd is passed down and AB is pushed up. This makes the coil rotate anti-clockwise by another half rotation.
The reversing of current in the coil is repeated after every half rotation due to which the coil rotates continuously.
this is the working of an electric motor
