18. Electric Field of Point Charges in a Plane

# 18 Electric Field - Electric Field of Point Charges in Plane(1 Determine magnitude of E1 and E1 and identify directions in plane E1 = k|q1 | k|q2 |

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Unformatted text preview: Electric Field of Point Charges in Plane (1) Determine magnitude of E1 and E1 and identify directions in plane: E1 = k|q1 | k|q2 | = 7.99N/C, E2 = = 4.32N/C. (3m)2 (5m)2 E E1 E2 3 2 1 q = +8nC 1 Determine x- and y-components of E1 and E1 and of the resultant field E: x E1 = 0, y E1 = 7.99N/C; y E2 x E2 = -3.46N/C, = 2.59N/C; Ex = -3.46N/C, Ey = 10.6N/C. q =+12nC 2 x Determine magnitude and direction of E: q 2 2 E = Ex + Ey = 11.2N/C, = arctan ,, Ey Ex = 108 . 0 1 2 3 4 [m] 11/1/2008 [tsl18 1/5 Electric Field of Point Charges in Plane (2) 1m E (a) Find the electric charge q2 . + q = 3nC 1 45 o 1m q2 = ? E =? (b) Find the angle . 1m q1 = 2nC 1m q2 = 4nC 11/1/2008 [tsl20 2/5 Electric Field of Point Charges in Plane (3) Two point charges, one known and the other unknown, produce a horizontal electric field as shown. What is the value of the unknown charge? E 5m 5m q=? 1nC 11/1/2008 [tsl21 3/5 Electric Field of Point Charges in Plane (4) Consider four triangles with point charges of equal magnitude at two of the three corners. (1) a a a (2) a a a (3) a a (4) a a (a) Determine the direction of the electric field Ei at the third corner of triangle (i). (b) Rank the fields Ei according to strength. 11/1/2008 [tsl326 4/5 Electric Field of Point Charges in Plane (5) Find magnitude and direction of the resultant electric field at point P . k|q1 | = 3.38 N/C. 8m2 k|q2 | = 6.75 N/C. E1 = 8m2 k|q3 | E1 = = 3.38 N/C. 2 8m Ex = E1 cos 45 + E2 cos 45 = 4.78 N/C. E1 = Ey = E2 = 6.75 N/C. q 2 2 E = Ex + Ey = 8.27 N/C. tan = Ey = 1.41. Ex E2 E1 Ey E E3 2m Ex 2m q 1= +3nC q 2= +3nC 2m q 3= -3nC x = arctan 1.41 = 54.7 . 11/1/2008 [tsl371 5/5 ...
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## This note was uploaded on 04/30/2008 for the course PHYS 204 taught by Professor Andrevantonder during the Spring '07 term at Rhode Island.

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18 Electric Field - Electric Field of Point Charges in Plane(1 Determine magnitude of E1 and E1 and identify directions in plane E1 = k|q1 | k|q2 |

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