What is the strength of the electric field at the position indicated by the dot

Question

What is the strength of the electric field at the position indicated by the dot in the figure? (Figure 1). Let r 3.8 cm Express your answer to two significant figures and include the appropriate units. E 4675 Submit Previous Answers Request Answer Figure 1 of 1 Incorrect, Try Again; 4 attempts remaining 3.0 nC Part B What is the direction of the electric field at the position indicated by the dot in the figure? 45° below horizontal to the left 45° above horizontal to the left. Horizontal to the left Horizontal to the right. 3.0 nC +

Explanation / Answer

a. electric filed due to one charge

E = k*q/d^2

= 9*10^9*3*10^-9/(0.038^2 + 0.038^2)

= 0.9*10^4 N/c

Enet = sqrt(2)*E

= 1.414*0.9*10^4

= 1.273*10^4 N/c

b. What is the direction of the electric field at the position indicated by the dot in the figure? Specify the direction as an angle above the horizontal line.

=tan-1[0.9*10^4/0.9*10^5)=45degree

45° below horizontal to the left .

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