- #1
joej
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I'm doing the following problem, it seems to me that I am doing all the correct steps but my answer differs from the answer key, am I missing something?
1. What is the magnitude and the direction of the electric field at a point midway in between a -8.0uC and a +6.0uC change 4cm apart.
This is what I'm doing:
E = ( k * (Q1 / r1^2) ) * ( 1 + ( (Q2 / Q1) / (r2^2 / r1^2) ) )
==
(9x10^9 * ( (8 * 10^-6) / ( 2 * 10^-2) ) ) * ( 1 + ( (6 / 8) / (2 / 2) ) )
==
3600000 * 1.75 = 6300000 N/C
now... that is what I'm getting, could somoen please point out to me what I am forgetting to do, if anything.
__________edit
stupidity strikes again... forgot to square r1
1. What is the magnitude and the direction of the electric field at a point midway in between a -8.0uC and a +6.0uC change 4cm apart.
This is what I'm doing:
E = ( k * (Q1 / r1^2) ) * ( 1 + ( (Q2 / Q1) / (r2^2 / r1^2) ) )
==
(9x10^9 * ( (8 * 10^-6) / ( 2 * 10^-2) ) ) * ( 1 + ( (6 / 8) / (2 / 2) ) )
==
3600000 * 1.75 = 6300000 N/C
now... that is what I'm getting, could somoen please point out to me what I am forgetting to do, if anything.
__________edit
stupidity strikes again... forgot to square r1
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