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I was hoping that somebody could help me. I'm stuck again!

a rod with (lambda) coulombs of charge per meter of its length has the shape of a circular arc of radius R. The rod subtends an angle (theta). Shpw that the magnitude of the electric field at the centre of the circular arc is:

E=[1/(4*pi*E0)] [(2*lambda)/R] sin (theta/2)

Where R is the radius from the rod to the centre of the electic field

OK, I know that I somehow have to change the formula for the electric field of a rod to get that. The formula for the electric field of a rod is:

E==[1/(4*pi*E0)] [(2*lambda)/r]

where r is the vertical distance from the rod

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# Homework Help: Stuck again - electric field and circular arc

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