If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced to 50% (assuming that the magnetic circuit remains unsaturated). the maximum core flux density will
A. change to three times the original value.
B. change to 1.5 times the original value.
C. change to 0.5 times the original value
D. remain the same as the original value.
Share your understanding of this question with the correct explanation.