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A current carrying loop is placed in a ...

A current carrying loop is placed in a uniform magnetic field in four different orientations , I,ii,iii & iv arrange them in the decreasing order of potential Energy`



A

`I gt III gt II gt IV`

B

`I gt II gt III gt IV`

C

`I gt IV gt II gt III`

D

`III gt IV gt I gt II`

Text Solution

Verified by Experts

The correct Answer is:
C
`U= -MB cos theta`
`U_(I)= -MB cos 180^(@)= +MB`
`U_(II) = -MB cos 90^(@)=0`
`U_(III) = - MB cos ("Acute angle")= -ve`
`U_(IV)= -MB cos ("Obtuse angle") = +ve`
`rArr I gt IV gt II gt III`
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