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A rectangular loop of sides 10 cm and 5 ...

A rectangular loop of sides 10 cm and 5 cm carrying a current I of 12 A is placed in different orientations as shown in the figures below ,

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

(1) and (2), respectively

B

(1) and (3), respectively

C

(2) and (4), respectively

D

(1) and (3), respectively

Text Solution

Verified by Experts

The correct Answer is:
C
`tau = IAB sin theta`
where `theta` is the angle between `vecB and vecA`
if `theta rarr 0, tau = 0 `
then `vecB ||vecA rarr` stable equilibrium.
also if a `180^@, tau = 0`
then `vecB||hatArarr` unstable equilibrium.
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