A helium nucleus makes a full rotation i...

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

`10^(-19)/mu_(0)`

`10^(-19) mu_(0)`

`2 xx 10^(-10) mu_(0)`

`(2 xx 10^(-19))/(mu_(0))`

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