ch22-p007 - 7. At points between the charges, the...

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Let x be the coordinate of P , the point where the field vanishes. Then, the total electric field at P is given by () 21 2 2 02 1 || 1 4() qq E xx πε ⎛⎞ =− ⎜⎟ ⎝⎠ . If the field is to vanish, then 2 2 2 22 2 11 ||( ) . | | q x x q =⇒ = −− Taking the square root of both sides, noting that | q 2 |/| q 1 | = 4, we obtain 70 cm 2.0 20 cm x x = ± . Choosing –2.0 for consistency, the value of x is found to be x = 30 cm. 7. At points between the charges, the individual electric fields are in the same direction
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This note was uploaded on 06/07/2010 for the course PHYS 344 taught by Professor Bb during the Spring '10 term at The Petroleum Institute.

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