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A light charged particle is revolving in...

A light charged particle is revolving in a circle of radius r in electrostatic attraction of a static heavy particle with opposite charge. How does the magnetic field B at the centre of the circule due to the movig charge depend on r?

A

`Bprop 1/r`

B

`Bprop 1/(r^(2))`

C

`Bprop1/(r^(3/2))`

D

`Bprop1/(r^(5/2))`

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