Question

& Competitive Exams (Level-1)
Moving Charges and Magnetism 149
Try Yourself
16. Find magnetic moment in following cases
y,
B
RES
R
Х
R
NK
Z
(i)
(ii)
(Each segment is of length 1)​

Answer 1

Answer:

Hey mate

Explanation:

I think your answer is

Magnetic moment  M=6 J/T

Magnetic field  B=0.44 T

(a) :

(i)  :  Work done in rotating the magnet normal to the magnetic field    W=MB(cosθ1−cosθ2)

where  θ1=60o  and θ2=90o

⟹ W=6×0.44(cos60o−cos90o)=6×0.44(0.5−0)=1.32 J

Work done in rotating the magnet opposite to the magnetic field    W=MB(cosθ1−cosθ2)

where  θ1=60o  and θ2=180o

⟹ W=6×0.44(cos60o−cos180o)=6×0.44(0.5+1)=3.96 J

(b) :  Torque in case (ii)    τ=MB sinθ2

⟹ τ=6×0.44×sin180o=0

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