Download App

4. Moving charges and magnetism — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics4. Moving charges and magnetism1 Mark
MCQ
A square current carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is $\overrightarrow F$ the net force on the remaining three arms of  the loop is
  • A
    $3$$\overrightarrow {F} $
  • ✓
    $-$$\;\overrightarrow {\;F} $
  • C
    $-3$$\overrightarrow {\;F} $
  • D
    $\overrightarrow {\;F} $
✓

Answer

Correct option: B.
$-$$\;\overrightarrow {\;F} $
b
Let $ABCD$ is a square loop carrying current placed in a uniform magnetic field,

Due to this field the conductors of the loop will experience force.

The direction and magnitude of the force is directly proportional to the current carried in the conductor.

Given,

Force in one arm $AB = F$

since opposite branches of this loop carry current in opposite direction

$==>$ force in the opposite arm $CD = -F$

Similarly The force in in the branches $AD$ and $BC$ will be opposite in direction and cancel out when added.

Hence net force on the remaining three arms of the loop will be $(b)$ $-F$

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 charge on electron is:
→
A parallel beam of electrons travelling in $x-$ direction falls on a slit of width $d$ (see figure) . If after passing the slit, an electron acquires momentum $P_y$ in the $y-$ direction then for a majority of electrons passing through the slit ( $h$ is Planck's constant)
→
The zone in a semiconductor diode where no free charge carriers exists is known as the :
→
An ammeter and a voltmeter of resistance $R$ are connected in series to an electric cell of negligible internal resistance. Their readings are $A$ and $V$ respectively. If another resistance $R$ is connected in parallel with the voltmeter
→
The time period of rotation of the sun is $25$ days and its radius is $7 \times {10^8}m$. The Doppler shift for the light of wavelength $6000 Å$ emitted from the surface of the sun will be......$\mathop A\limits^o $
→
The refractive indices of glass and water w.r.t. air are 3/2 and 4/3 respectively. The refractive index of glass w.r.t. water will be
→
The frequency of oscillation of current in the inductance is
→
The value of scattering angle of alpha particle for maximum value of impact parameter is :
→
If $M$ is the atomic mass and $A$ is the mass number, packing fraction is given by
→
When $2 $ $amperes$ current is passed through a tangent galvanometer, it gives a deflection of $30^o$. For $60^o$ deflection, the current must be........$amp$
→