How much voltage is in the primary coil if there are 3200 winding in the secondary coil 500 winding in the primary and 25v in the secondary?

Voltage in the primary winding of the coil is 3.9 V

Explanation:

As we know by the principle of transformer we have

here we know that

now we have

low freq = 100 mhz

low wavelength =101.7m

length = 3x10^8/freq