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A semi-circular arc of radius ' a ' is charged uniformly and the charge per unit length is λ. The electric field at the centre of this arc is
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
A semi-circular arc of radius a is charged uniformly and the charge ...
λ= linear charge density; Charge on elementary portion dx=λdx.

Electric field at 
Horizontal electric field, i.e., perpendicular to AO, will be cancelled. Hence, net electric field = addition of all electrical fields in direction of AO =ΣdEcosθ
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