problem23_30

# University Physics with Modern Physics with Mastering Physics (11th Edition)

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23.30: (a) , 0 2 + = Q Q V V V so V is zero nowhere except for infinitely far from the charges. The fields can cancel only between the charges 2 2 2 2 2 2 ) ( ) ( ) 2 ( x x d x d Q k x kQ E E Q Q = - - = = . 2 1 + = d x The other root, , 2 1 - = d x does not lie between the charges. (b) V can be zero in 2 places, A and B . . of left the to 0 ) 2
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Unformatted text preview: 3 ) 2 ( ) ( : 2 Q E E d y y d Q k y Q k B at d x x d Q k x Q k A at Q Q-= = → = + +-= → =-+-1 2 ) ( ) 2 ( 2 2-= → + = d x x d Q k x kQ (c) Note that E and V are not zero at the same places....
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• charges kQ, d+y EQ

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