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Question: Charge Q is uniformly distributed along a thin, flexible rod of length L. The rod is then bent into the semicircle shown in the figure (Figure 1) .
Part A: Find an expression for the electric field Eâƒ- at the center of the semicircle.
Hint: A small piece of arc length Î"s spans a small angle Î"θ=Î"s /R, where R is the radius.
Express your answer in terms of the variables Q, L, unit vectors i^, j^, and appropriate constants.
Part B: Evaluate the field strength if L = 19 cm and Q = 35 nC . Express your answer with the appropriate units.
A 6 m board of mass 7 kg is hinged at one end, with a 60 kg block nesting on the board 245 cm from the hings. A force ~F is applied vertically at the other end to lift of the board. Find the force exerted by the hinge
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