Answer
(a) Less than
(b) 9.4 turns
Work Step by Step
(a) Since the voltage is required to be stepped down, to achieve this we know that the number of turns on the secondary coil must be less than that of the primary coil. Hence, the number of turns on the secondary coil becomes less than 125.
(b) We can find the number of turns on the secondary coil as follows:
$N_s=(N_p)(\frac{V_s}{V_p})$
We plug in the known values to obtain:
$N_s=(125~turns)(\frac{9.0}{120})$
$N_s=9.4~turns$
