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A compass needle placed at a distance r ...

A compass needle placed at a distance r from a short magnet in tan A position showns a deflection of `60^(@)`. If the distance is increased to `r(3)^(1//3)`, then the deflection of the compass needle is:

A

`30^@`

B

`60^@ xx(3)^(1/3)`

C

`60^@ xx(3)^(2/3)`

D

`60^@ xx(3)^(3/3)`

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