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[" 19.A helium nucleus makes a full rola...

[" 19.A helium nucleus makes a full rolation in a circle of radius "0.8" metre in two seconds.The value of "],[" the magnetic field "B" at the centre of the circle will be "],[[" (A) "(10^(-19))/(mu_(0))," (B) "10^(-19)mu_(0)," i."]]

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