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    ??? Answer is D???? Thanks for any help.


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    (Original post by Meessh123)
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    ??? Answer is D???? Thanks for any help.


    Posted from TSR Mobile
    You should know a formula for the force on the wire F=BLI
    Divide that force by the number of electrons in the wire.

    The number in the wire is found from multiplying the number given per unit volume by the volume of the wire.
    Volume of wire is length x cross section

    Do the maths and you will get the required answer.


    There is another, slightly quicker, way of doing this as others may suggest.

    Spoiler:
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    F=BIL
    Ne=nAL
    Force per electron = BIL / nAL
    Cancel L
 
 
 
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Updated: January 22, 2015
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