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[" A helium nucleus makes a full rotatio...

[" A helium nucleus makes a full rotation 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)],[" (C) "2times10^(-10)mu_(0)," (D) "(2times10^(-10))/(mu_(0))]]

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