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[" 18.A thin ring of radius "R" meter ha...

[" 18.A thin ring of radius "R" meter has charge "9],[" coulomb uniformly spread on it.The ring rotates "],[" about its axis with a constant frequency of "f],[" magnetic "],[" magnet "],[" of "2s" in "],[" crotesla."],[" crotesla."],[" crotesla."],[" blacing a "],[" eriod of "],[qquad mu_(0)q]

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