
#1
Jan1114, 03:45 PM

P: 285

Is the electric force on a charged particle always in the same direction of the field? What if it is an uncharged particle?
If you have an electron, with the field vectors pointing radially inward, then place a proton in the field, then yes since the proton is attracted towards the electron as well. But if you place an electron in the field, the electric force will not be in the same direction as the force, right? The same concept applies with an electric field about a stationary proton, if you have another proton, then yes, the directions of the electric force and field are the same. But if you have an electron, this is not true. Could anyone please clarify or confirm anything I have said? Thank you! 



#2
Jan1114, 04:06 PM

Mentor
P: 11,255





#3
Jan1114, 05:45 PM

P: 285

Also, based on this:
I understand why C is correct. But isn't option A and technically C right too? Since the field vectors would be pointing downward and right with the greatest magnitude in situation 1. 



#4
Jan1114, 06:05 PM

P: 285

Electric Field Vectors
Sorry for the extra questions. They're just related and I rather not open a new thread.
For: Why is the force exerted by a uniform electric field not parallel to it? The force and electric field vectors are parallel, right? Why does the field have to not be parallel to the dipole moment in order for there to be torque? Why can't it be just perpendicular as well? Dipole moments are a little new and any explanation would be very helpful! 



#5
Jan1414, 11:26 PM

P: 285

Any help? I am trying to think about it logically but am missing something.




#6
Jan1414, 11:39 PM

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P: 39,708





#7
Jan1414, 11:42 PM

Mentor
P: 39,708

There may be a temporary force on the ends of the dipole if it is not yet aligned with the Efield, but eventually what happens? 



#8
Jan1414, 11:56 PM

P: 285





#9
Jan1514, 12:12 AM

Mentor
P: 39,708

Once the dipole is aligned with the Efield, there is no net force or torque. I have a feeling that you can write the equations that show that... 


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