For the x-ray circuit to function properly, the rectifiers must be located between the:

The correct choice indicates that the rectifiers should be located between the step-up transformer and the x-ray tube. This configuration is crucial for the proper functioning of the x-ray circuit for a couple of reasons.

Primarily, the role of the rectifiers is to convert the alternating current (AC) produced by the power supply into direct current (DC), which is necessary for the operation of the x-ray tube. The x-ray tube requires a consistent flow of electrons in one direction to produce x-rays effectively. Without rectification, the alternating current would create alternating voltage, which could disrupt the electron flow and produce inconsistent or ineffective x-ray production.

By placing the rectifiers after the step-up transformer, which increases the voltage for x-ray production, and before the x-ray tube, the circuit ensures that the high voltage supplied to the x-ray tube is direct current. This configuration allows for efficient and reliable x-ray generation, as it protects the tube from the potentially damaging effects of reverse current and maintains optimal performance.

In contrast, having rectifiers in the other suggested positions would either disrupt the necessary high-voltage DC supply or not adequately convert the power for the x-ray tube's operational needs. Thus, the placement of rectifiers between the step-up transformer and