A rectangular loop of sides ` 10 cm and 5 cm` carrying a current `1 of 12 A` is placed in different orientations as shown in the figure below:
If there is auniform 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. `(a)` and `(b)` respectively
B. `(a)` and `(c)` respectively
C. `(b)` and `(d)` respectively
D. `(b)` and `(c)` respectively

Answer

3

Explanation

For stable equilibrium angle should be zero and for unstable equilibrium angle between `vecM` and `vecB` should be `pi`.