In an entanglement experiment, if you remove the polarizer on Bob's side, it means that Bob is no longer measuring or filtering the entangled particles according to their polarization. As a result, Bob's measurement apparatus would no longer interact with the entangled particles, and the entanglement between the particles would not be utilized or observed.
When the polarizer is present, it allows Bob to measure the polarization of the entangled particles and observe the correlations between the particles' states. However, by removing the polarizer, Bob effectively removes the means to determine the polarization of the particles.
In entanglement experiments, the removal of the measurement apparatus on one side does not affect the entanglement itself. The entangled particles would still remain in a correlated state, but the lack of measurement prevents the observation or utilization of that entanglement.
It's important to note that removing the polarizer on Bob's side does not cause any instantaneous changes or "collapse" of the entangled particles' states. The entanglement remains intact, but its effects cannot be observed or measured without the appropriate apparatus in place.