Asked by Robert
                An antiproton (which has the same properties as a proton except that its charge is -e) is moving in the combined electric and magnetic fields of the figure:  h   tt   p://post    image.  org/image/2sh3s3hs4/
What are the magnitude and direction of the antiproton's acceleration at this instant?
What would be the magnitude and direction of the acceleration if \vec v were reversed?
            
        What are the magnitude and direction of the antiproton's acceleration at this instant?
What would be the magnitude and direction of the acceleration if \vec v were reversed?
Answers
                    Answered by
            drwls
            
    Correct on the negative charge of the antiproton. The magnetic force is q V x B  (vector cross product) and the electric force is q E (scalar multiplication of E by a constant). 
The magnetic force is in the direction of the red arrows (from the right-hand rule, with negative q), and the electric force is opposite to that.
If the direction of V is reversed, the electric force remaqins the same and the directikon of the magnetic force reverses.
    
The magnetic force is in the direction of the red arrows (from the right-hand rule, with negative q), and the electric force is opposite to that.
If the direction of V is reversed, the electric force remaqins the same and the directikon of the magnetic force reverses.
                    Answered by
            Robert
            
    Solved it.  Thanks.
    
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