Answer to Question #138544 in Electric Circuits for vuty

Question #138544
Three charged particles are arranged on corners of a square. (i) What is the direction of the electric field at the upper right corner?
1
Expert's answer
2020-11-09T10:12:47-0500

Solution

For this question consider side of square is "a" Charges are "q" Figure can be shown as



Electric field on fourth corner is given as

E1=kqa2E_1=\frac{kq}{a^2}


E2=kqa2E_2=\frac{kq}{a^2}

Resultant of both above field is

E=2kqa2E'=\frac{\sqrt{2}kq}{a^2}


E3=kq2a2E_3=\frac{kq}{2a^2}

And finally the resultant electric field will be in direction of E3 on fourth corner is given by

E=2kqa2+kq2a2E=\frac{\sqrt{2}kq}{a^2}+\frac{kq}{2a^2}


E=kqa2(2+12)E=\frac{kq}{a^2}(\sqrt{2}+\frac{1}{2})

Direction is resultant is 45° from x and y so vector is direction of resultant electric is given by


E=kqa2(2+12)12(i+j)E=\frac{kq}{a^2}(\sqrt{2}+\frac{1}{2}) \frac{1}{\sqrt2}(i+j)


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