MCQ
A conducting loop is placed in a uniform magnetic field with its plane perpendicular to the field. An $emf$ is induced in the loop if
  • A
    it is rotated about its axis
  • it is rotated about a diameter
  • C
    it is not moved
  • D
    it is given translational motion in the field

Answer

Correct option: B.
it is rotated about a diameter
b
An $emf$ is induced only when magnetic flux linked with the loop changes. This is possible when the loop is rotated about a diameter.

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

Similar questions

An observer moves towards a stationary source of sound with a speed $1/5^{th}$ of the speed of sound. The wavelength and frequency of the source emitted are $\lambda $ and $f$ respectively. The apparent frequency and wavelength recorded by the observer are respectively
The power radiated from a linear antenna of length $l$ is proportional to

(Given, $\lambda=$ Wavelength of wave):

Find the current in the $10\, \Omega$ resistance
The length of a sonometer wire tuned to a frequency of $250 Hz$ is $0.60$ metre. The frequency of tuning fork with which the vibrating wire will be in tune when the length is made $0.40$ metre is .... $Hz$
A sliver wire has mass $(0.6 \pm 0.006) \; g$, radius $(0.5 \pm 0.005) \; mm$ and length $(4 \pm 0.04) \; cm$. The maximum percentage error in the measurement of its density will be $......\,\%$
The distance of the moon from earth is $3.8 \times {10^5}km.$ The eye is most sensitive to light of wavelength $5500 Å$. The separation of two points on the moon that can be resolved by a $500\ cm$ telescope will be......$m$
Two wavelengths $\lambda_1$ and $\lambda_2$ are used in Young's double slit experiment $\lambda_1=450 \mathrm{~nm}$ and $\lambda_2=650 \mathrm{~nm}$. The minimum order of fringe produced by $\lambda_2$ which overlaps with the fringe produced by $\lambda_1$ is $n$. The value of $n$ is_________.
Radius of a circular loop placed in a perpendicular uniform magnetic field is increasing at a constant rate of $r_0 ms ^{-1}$. If at any instant radius of the loop is $r$, then emf induced in the loop at that instant will be
Two circularly shaped linear polarisers are placed coaxially. The transmission axis of the first polariser is at $30^{\circ}$ from the vertical while the second one is at $60^{\circ}$, both in the clockwise sense. If an unpolarised beam of light of intensity $I=20 \,W / m ^{2}$ is incident on this pair of polarisers, then the intensities $I_{1}$ and $I_{2}$ transmitted by the first and second polarisers respectively, will be close to
The $SI$ unit of magnetic permeability is