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Problem 6 Three charges,-4m, 2pC and-6μC are placed at the corners of a rectangle, as shown in figure (17.58). Determine the electric field at point P. 3cm Figure 17.58: Problem 6

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Answer #1

for positive charge electric field at point P is repulsive and for negative charge electric field at point P is attractive.

q1=-4μc =-4x10-6c

q2=2μc=2x10-6c

q3=-6μc=-6x10-6c

Let angleADC-α tana RO/PQ-3/4 α-36. 87degree n vector form x- component of electric field Ex--Ecos aE2
y- component of electric field- RP2-32+42-25cm2-25x104m2 SP2-32-9x10-4m2 k-8.99x10°N-m2/c2Epkg/QP-8.99x10%2x10-61(16x10)-1. 12x 107N E3-kqs/SP2-8.99x10%6x10-649x10-4)-5.99x10N Ex-(-1.44cos36.87 +1.12)x10%-0.03x10N E (1.44sin36.87+5.99)x10-6.85x10N NET ELECTRIC FIELD E-(E} +EyW2-(+0.03x0. 03+6.8 5x6.85)1/2x107-6.85x 107N Ans Derection from +x axix counter clockwisé- tan 0 EEx- -6.85/0.03 8-90·25degree Ans

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