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The becomes strongly magnetised.The bar is up.
The pulls the copper bar to the right.
The break the circuit and the current stops flowing.
The carrying coil of wire in the field experiences a
( current directions is to field)
If the current , the direction of the force on the wire reverses.
The cone vibrates and .
The carrying coil of wire in the field experiences a .
The on the coil changes ( backwards and forwards ) causing vibration
When the cone vibrates, molecules in front of it also .
Thus a sound wave travels in the form of and rarefactions.
The note has intensity.
A sound is heard.
A relay is used, e.g. In the motor circuit.
As the is too , handling it directly using a switch is .
A flows in the , so it becomes .
The in the coil the pivoted iron armature.
The armature about the pivot and causes the contacts to close.
The of the LDR .
The on the core are . The armature still to the core.
Iron is easily magnetised and , while steel magnetism.
With iron, when the switch is off, the armature does not stay to the core.
The of attraction of the is too .
The iron bar is .
The pulls the bar.
Iron is easily and ,while steel retains .
The core are . The (armature still) to the (core).
Series with C and
The of the LDR .
The note has
The cone ,the air also .
A wave travels in the form of and .
The reverses the direction of the on the wire.
The cone back and .
turns in coil
electromagnet to the iron bar
iron bar of a weight