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OpenStudy (samigupta8):
a non conducting ring of radius R is placed on a rough horizontal surface as shown in figure.Upper half of ring have uniform linear charge density +λ and lower half of uniform linear charge density -λ.An external hypothetical electric field E=ey/R is exist in a space.The magnitude of friction force acting on a ring so that ring is doing pure rolling on a horizontal surface is
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OpenStudy (samigupta8):
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