6. The diagram shows an electrically operated model
railway signal. The signal is pivoted so that it can swing
up or down. In the electric circuit, either switch A or
switch B can be closed, but not both at the same time.
a.
The switch is moved from the middle position
to position A.

i. What type of pole will be made at the
top of the iron rod inside the coil ? (1)

iron bar fixed to the
back end of the signal
Explain what will happen to the signal.