motor effect (1 Viewer)

[kractus]

The answer is D. I'm confused on how they arrived at the answer and how actually to determine rotation just based on the charges?

 

[MJRey]

Where is this question from?

 

[nathanzhou1234]

View attachment 37568
The answer is D. I'm confused on how they arrived at the answer and how actually to determine rotation just based on the charges?

Current flows from the positive to negative terminal. Using this current we can determine the magnetic field of the solenoids and the current in the motor, then use right hand rule to find force