Let xbe the coordinate of P, the point where the field vanishes. Then, the total electric field at Pis given by ()2122021||14()qqExxπε⎛⎞=−⎜⎟−−⎝⎠. If the field is to vanish, then 22222211||().||qxxq−=⇒=−−−Taking the square root of both sides, noting that |q2|/|q1| = 4, we obtain 70 cm2.020 cmxx−= ±−. Choosing –2.0 for consistency, the value of xis 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.