Consider two wire coil inductors, La and Lb. The inductor La is smaller than Lb in diameter and La is placed inside of Lb. If an ac current is applied to the inductor Lb,
a) the voltage across the inductor La only depends on the mutual inductance and does not depend on the ac frequency.
b) the voltage across the inductor La would decrease if the frequency of the ac current increases.
c) the voltage across the inductor La only depends on the amplitude of the ac current and does not depend on the ac frequency.
d) the voltage across the inductor La would increase if the frequency of the ac current increases.