A neighborhood transformer on the top of a utility pole transforms 12.0 kV 60.0 Hz alternating voltage down to 120.0 V to be used inside a house. If the secondary coil of the transformer has 134.0 turns, then how many turns does the primary coil have

The primary coil has 13,400 turns

Explanation:

Voltage Transformers

A transformer is an electrical apparatus that converts an alternating electrical voltage to another. Step-down transformers lower the voltage from higher levels (kilovolts) to consumer levels (120/240 Volts).

The ratio between both voltages can be computed as

Where V1 is the primary voltage and V2 is the secondary voltage. This ratio depends on the turns ratio of the coils wounded in a common magnetic core.

Being N1 the number of turns of the coils of the primary side and N2 the number of turns in the secondary coil. Both relations give us

Solving for N1

We have:

Calculate N1

The primary coil has 13,400 turns

i think the answer is a, hope this is right, that would be my best guess.

grav forces affect all objects magnetic forces affect magnetic objects and electric currents