Download App

5. Magnetism and matter — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics5. Magnetism and matter1 Mark
MCQ
A magnetic dipole in a constant magnetic field has 
  • A
    maximum potential energy when the torque is maximum
  • B
    zero potential energy when the torque is minimum
  • ✓
    zero potential energy when the torque is maximum
  • D
    minimum potential energy when the torque is maximum.
✓

Answer

Correct option: C.
zero potential energy when the torque is maximum
c
Potential energy of dipole,

$U =  - pE\,\cos \,\theta $

Torque experienced by dipole

$\tau  = pE\,\sin \,\theta $

Torque will be maximum $({\tau _{\max }})$ when $\theta  = {90^o}$

then potential energy $U = 0$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 5. Magnetism and matter→5. Magnetism and matter — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Choose the correct option about light.
→
At some location on earth the horizontal component of earth’s magnetic field is $18\times10^{-6}\,T$. At this location, magnetic needle of length $0.12\, m$ and pole strength $1.8\, A\,m$ is suspended from its mid-point using a thread, it makes $45^o$ angle with horizontal in equilibrium. To keep this needle horizontal, the vertical force that should be applied at one of its ends is
→
Find $V_{AB}$....$V$
→
The bob of a simple pendulum is replaced by a magnet. The oscillations are set along the length of the magnet. A copper coil is added so that one pole of the magnet passes in and out of the coil. The coil is short-circuited. Then which one of the following happens
→
An electron (charge $=1.6 \times 10^{-19} C$ ) is accelerated through a potential of $100,000 V$. The energy acquired by the electron is
 
→
A bar magnet is released from rest along the axis of a very long vertical copper tube. After some time the magnet will
→
In a concave mirror experiment, an object is placed at a distance ${x_1}$ from the focus and the image is formed at a distance ${x_2}$ from the focus. The focal length of the mirror would be
→
The nucleus $_{48}^{115}Cd$ after two successive ${\beta ^ - }$ decays will give
→
Audio signal cannot be transmitted because
→
In a charged capacitor, the energy is stored in:
→