1.

Dipole moment of coil is 2hati+3hatj+5hatk. If this coil is placed in uniform magnetic field having magnitude 3hatkT, torque acting on it is _____ Nm.

Answer»

`sqrt35`
`sqrt117`
`sqrt25`
`sqrt135`

SOLUTION :`vectau=vecmuxxvecB=|(HATI,HATJ,HATK),(2,3,5),(0,0,3)|`
`vectau=9hati-6hatj+0hatk=9hati-6hatj`
`|vectau|=sqrt(81+36)`
`therefore|vectau|=sqrt117`


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