JEE MAIN - Physics (2015 (Offline) - No. 9)
A rectangular loop of sides $$10$$ $$cm$$ and $$5$$ $$cm$$ carrying a current $$1$$ of $$12A$$ is placed in different orientations as shown in the figures below :
_en_9_1.png)
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 ?
$$(B)$$ and $$(D)$$, respectively
$$(B)$$ and $$(C)$$, respectively
$$(A)$$ and $$(B)$$, respectively
$$(A)$$ and $$(C)$$, respectively
Explanation
For stable equilibrium $$\mathop M\limits^ \to ||\mathop B\limits^ \to $$
For unstable equilibrium $$\mathop M\limits^ \to ||\left( { - \mathop B\limits^ \to } \right)$$
For unstable equilibrium $$\mathop M\limits^ \to ||\left( { - \mathop B\limits^ \to } \right)$$
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