Magnetic field due to currentHard
Question
A rectangular loop of sides 10 cm and 5 cm carrying a current I of 12 A is place in different orientations as shown in the figures below :
(a)
(b)
(c)
(d) 
If there is a uniform magnetic field of 0.3 T in the positive z direction, in which orientations the loop would be in (i) stable equilibrium and (ii) unstable equilibrium ?
(a)
(b)(c)
(d) If there is a uniform magnetic field of 0.3 T in the positive z direction, in which orientations the loop would be in (i) stable equilibrium and (ii) unstable equilibrium ?
Options
A.(b) and (d), respectively
B.(b) and (c), respectively
C.(a) and (b), respectively
D.(a) and (c), respectively
Solution
For stable equilibrium 
For unstable equilibrium
B = magnetic field
M = magnetic moment
For unstable equilibrium
B = magnetic field
M = magnetic moment
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