A rectangular loop of wire, supporting a mass m, hangs with one e… - Vidyadip

MCQ

A rectangular loop of wire, supporting a mass $m$, hangs with one end in a uniform magnetic field $\vec B$ pointing into the plane of the paper. $A$ clockwise current is set up such that $i> mg/Ba,$ where $a$ is the width of the loop. Then

A
The weight decends due to a vertical force caused by the magnetic field
B
The weight moves towards rightward
✓
The weight rises due to a vertical force caused by the magnetic field
D
None of these

✓

Answer

Correct option: C.

The weight rises due to a vertical force caused by the magnetic field

c
$\vec F = I\overrightarrow {dl} \times \overrightarrow B $

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 4. Moving charges and magnetism→4. Moving charges and magnetism — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

The following graph depicts the inverse of magnification versus the distance between the object and lens data for a setup. The focal length of the lens used in the setup is .................... $m$

An electric bulb illuminates a plane surface. The intensity of illumination on the surface at a point $2m$ away from the bulb is $5 \times {10^{ - 4}}$ $phot$ ($lumen/cm^2$). The line joining the bulb to the point makes an angle of $60^{o}$ with the normal to the surface. The intensity of the bulb in candela is

A radioactive nucleus can decay by two different processes. Half-life for the first process is $3.0\, hours$ while it is $4.5\, hours$ for the second process. The effective half- life of the nucleus will be $.........\,hours.$

Ratio of magnetic intensities for an axial point and a point on broad side-on position at equal distance d from the centre of magnet will be or The magnetic field at a distance d from a short bar magnet in longitudinal and transverse positions are in the ratio

The work function of metal is 1 eV. Light of wavelength 3000 Å is incident on this metal surface. The velocity of emitted photo-electrons will be

A Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is

A carrier is simultaneously modulated by two sine waves with modulation indices of $0.4$ and $0.3$. The resultant modulation index will be

For non-conductors, the energy gap is

Electromagnetic waves are transverse in nature is evident by

When semiconductor is doped half with trivalent and half with pentavalent impurities, junction formed is known as: