Test Index

Class 12 NEET Physics Magnetism and Matter Questions

Question : 24 of 50

Marks: +1, -0

can be in equilibrium in two orientations, both the equilibrium states are unstable
can be in equilibrium in two orientations, one stable while the other is unstable.
experiences a torque whether the field is uniform or non uniform in all orientations.
can be in equilibrium in one orientation.

Solution:

When a current loop is placed in a magnetic field it experiences a torque. It is given by

\tau = \overset{\rightarrow}{M} \times \overset{\rightarrow}{B}

Where

\overset{\rightarrow}{M}

is the magnetic moment of the loop and

\overset{\rightarrow}{B}

is the magnetic field.

\tau = MB\sin\theta

where θ is angle between

\overset{\rightarrow}{M}

and

\overset{\rightarrow}{B}

When

\overset{\rightarrow}{M}

and

\overset{\rightarrow}{B}

are parallel (i.e. θ = 0°) the equilibrium is stable and when they are antiparallel (i.e.

\theta = \pi

) the equilibrium is unstable.

Go to Question:

Prev Question

Next Question