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Two short bar magnets of dipole moments ...

Two short bar magnets of dipole moments M and `Msqrt(3)` are joined at right angles to form a cross as depicted in the figure . The value of `theta` for which the system remains in equilibrium in a uniform external magnetic field B, is

A

`theta=30^@`

B

`theta=45^@`

C

`theta=60^@`

D

`theta=15^@`

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The correct Answer is:
C
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