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a non conducting ring of radius R and mass M is placed on rough surface .Q charge is uniformly distributed over ring ,a time variable magnetic feild B=4t 2 is applied at t=0 prependicular to plane of ring. if ring start rotating at t=2sec then cofficient of friction b/w ring & rough surface is.....

a non conducting ring of radius R and mass M is placed on rough surface .Q charge is uniformly distributed over ring ,a time variable magnetic feild B=4t2 is applied at t=0 prependicular to plane of ring. if ring start rotating at t=2sec then cofficient of friction b/w ring & rough surface is.....

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