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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

A

`2 xx 10^-19 mu_0`

B

`10^-19/mu_0`

C

`10^-19 mu_0`

D

`2 xx 10^-20 / mu_0`

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