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    Pls help! Why's the ans B?
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    I = naqv

    n and q are constants.

    What are you changing in that equation and what else can you change to keep I the same?
    • Thread Starter
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    But don't we have to consider length too?
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    Why would we?

    It doesn't figure in the equation.

    We use length when deriving the equation but it disappears at the end.
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    Oh so it's just there to confuse ><
    Thank you for all your brilliant comments and helpful contributions here
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    Yes, it's a 'red herring'.

    You're welcome.
 
 
 
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Updated: February 18, 2018
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