Electric field strength at the center of semicircle

1. The problem statement, all variables and given/known data
A uniformly charged insulating rod of length 12.0 cm is bent into the shape of a semicircle as shown in the figure below. The rod has a total charge of −7.50 µC.

Find the magnitude of the electric field at O, the centre of the semicircle.

2. Relevant equations
E = 2kq / pi r2
(Acquired on the internet)

3. The attempt at a solution
E = 2(9X109)(-7.5X10-6) / pi (0.06)2
E = -135000 / 0.01130973355
E = -11936620.73

magnitude: 11936620 N/C

Got it wrong… I don’t know why…


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