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jauneet singh Grade: 12
        

a point q charge is kept at the centre of the fixed semicircular thread having a uniform charge per unit length a,the radius of semicircular thread being r .the force required to keep the charge stationary is????

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear jauneet


 


6176-1440_7662_untitled.JPG


charge at the segment rdθ =ardθ


clearly horizontal component of force is cancel out because ring is symmetric about y axis


verticle force =Fcosθ =kqardθ/r2Cosθ


                               =kqa/r cosθ dθ


so total force = limit 0 to 90  ,  2∫ kqa/r cosθ dθ 


                    =limit 0 to 90  ,  2kqa/r∫ cosθ dθ 


                     = 2kqa/r





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Badiuddin

7 years ago
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