Question
A wire-loop confined in a plane is rotated in its own plane with some angular velocity. A uniform magnetic field exists in the region. Find the emf induced in the loop.
✓
Answer
$\text{i}=\text{v}(\text{B}\times\text{l})$
$=\text{vBl}\cos\theta$
$\theta$ is angle between normal to plane and $\vec{\text{B}}=90^{\circ}$
$=\text{vBl}\cos90^{\circ}=0.$
$=\text{vBl}\cos\theta$
$\theta$ is angle between normal to plane and $\vec{\text{B}}=90^{\circ}$
$=\text{vBl}\cos90^{\circ}=0.$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Explain the refraction of a plane wave from rarer medium to a denser medium, using Huygen's principle.
Two protons and two electrons are hanging freely at equal distances. Compare the repulsion force between proton and electron.
Consider a gold nucleus to be a sphere of radius 6.9 fermi in which protons and neutrons are distributed. Find the force of repulsion between two protons situated at largest separation. Why do these protons not fly apart under this repulsion?
Answer the following questions: In viewing through a magnifying glass, one usually positions one's eyes very close to the lens. Does angular magnification change if the eye is moved back?
Is it necessary to have two waves of equal intensity to study interference pattern? Will there be an effect on clarity if the waves have unequal intensity?
An electron is accelerated through a potential difference of 100 volts. What is the de-Broglie wavelength associated with it? To which part of the electromagnetic spectrum does this value of wavelength correspond?
de Broglie wavelength associated with an electron accelerated through a potential difference V is $\lambda$ What will be the de Broglie wavelength when the accelerating potential is increased to 4V?
→An inductor is connected to a battery through a switch. Explain why the emf induced in the inductor is much larger when the switch is opened as compared to the emf induced when the switch is closed.
A 10V cell of negligible internal resistance is connected in parallel across a battery of emf 200V and internal resistance $38\Omega$ as shown in the figure. Find the value of current in the circuit.
→Monochromatic light of frequency $6.0 \times 10^{14} Hz$ is produced by a laser. The power emitted is $2.0 \times 10^{-3} W$. (a) What is the energy of a photon in the light beam? (b) How many photons per second, on an average, are emitted by the source?
→