KCH 23 HW Item 3 3 of 11 > Part A What is the strength of the electric field at
ID: 2029742 • Letter: K
Question
KCH 23 HW Item 3 3 of 11 > Part A What is the strength of the electric field at the position indicated by the dot in the figure? (Figure 1). Let r4.6 cm Express your answer to two significant figures and include the appropriate units Figure 1 of SubmitPrev vious Answers Request Answer X Incorrect, Try Again; 2 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? Horizontal to the right. Horizontal to the left. 45° above horizontal to the left. 3.0 nC+Explanation / Answer
Bot the charges are positive and are at the equal distance so they will repel with the same magnitude.
If we draw the forces, the y component will cancel out the final field and only be the x component will present.
Then the final electric field will be twice the x component of one electric field of a charge because they are the same.
E=kq/r^2
r= 4.6 x sqrt2 = 6.50 cm or .065 m
E=(9 x 10^9)(3 x 10^-9)/(.065)^2
= 6390.53 N/C
Now the x component,
cos 45 = x/ 6390.53
x= 4518.79 N/C
Now multiply by 2
E= 9037.58 N/C in direction of 0 degrees
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