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    Probability question using r.v. X and Y what is W=min(X,Y) ?

    Homework Statement Y -----------1----2-----3------4 x---1----1/4----0-----0------0 ----2----1/8----1/8---0------0 ----3----1/12---1/12--1/12---0 ----4----1/16---1/16--1/16--1/16 The Joint PMF of random varables X and Y is given in the table above Let...
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    E Field of a line charge

    Homework Statement Infinite unknown line charges of 5nC/m lie along the (positive and negative) x and y axes in free space. Find E at P(0,0,4) Homework Equations E = (pl/2(pi)(eo)p)ap pi = 3.14... eo - permitivity of free space 8.854 x 10^-12 pl = line charge density ap = unit...
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    Q3 position if E = 0

    Homework Statement In free space, Q1 = 10nc at P1(0,-4,0) and Q2 = 20nC at P2(0,0,4). a. Find E at the origin (answered) E(r) = 5.617ay - 11.235az b. Where should a 30nC point charge be located so E=0 at the origin? (need help) Homework Equations E(r) = (1/4(pi)epsilon) sum...