20.) The following question contains the word EXCEPT.Please read the question carefully and look for the choice that could NOT cause the described studion. All of these use electromagnetism, EXCEPT: A. photo cell sensor. OB. ignition coils. C. power door locks. OD. washer pumps.

## Step 1<br />The problem is asking us to identify the option that does not use electromagnetism. Electromagnetism is a branch of physics that deals with the study of electric and magnetic fields and their interactions.<br /><br />## Step 2<br />Let's analyze each option:<br /><br />### A. Photo cell sensor<br />A photo cell sensor uses the photoelectric effect, which is a phenomenon in electromagnetism. Therefore, this option uses electromagnetism.<br /><br />### B. Ignition coils<br />Ignition coils use electromagnetic induction to convert low-voltage power from the car's battery to the high-voltage needed to ignite the fuel. Therefore, this option uses electromagnetism.<br /><br />### C. Power door locks<br />Power door locks use an electric motor to open and close the doors. This motor operates on the principles of electromagnetism. Therefore, this option uses electromagnetism.<br /><br />### D. Washer pumps<br />Washer pumps are typically mechanical devices that use hydraulic pressure to operate. They do not rely on electromagnetism. Therefore, this option does not use electromagnetism.