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A helium nucleus is moving in a circular...

A helium nucleus is moving in a circular path of radius 0.8m. If it takes 2s to complete one revolution. Find out magnetic field produced at the centre of the circle:

A

`mu_(0)xx10^(-19)T`

B

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

C

`2xx10^(-19)T`

D

`(2xx10^(-19))/(mu_(0))T`

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