A cycle wheel with 64 spokes is rotating with N rotations per sec… - Vidyadip

MCQ

A cycle wheel with $64$ spokes is rotating with $N$ rotations per second at right angles to horizontal component of magnetic field. The induced emf generated between its axle and rim is $E$. If the number of spokes is reduced to $32$ then the value of induced emf will be:

✓
$\text{E}$
B
$2\text{E}$
C
$\frac{\text{E}}{2}$
D
$\frac{\text{E}}{4}$

✓

Answer

Correct option: A.

$\text{E}$

The emf induced is independent of the number of spoke and only depends on the lenght of spoke and the angular speed.
Therefore emf induced is same as before $= E$

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 Electromagnetic Induction→Electromagnetic Induction — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

A $10\,\mu F$ capacitor is charged to a potential difference of $50\;V$ and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes $20\;volt$. The capacitance of second capacitor is....$\mu F$

The electric potential at the centre of a charged solid sphere of metal is:

In a hydrogen atom, an electron moves in a circular orbit of radius $5.2 \times {10^{ - 11}}\,m$ and produces a magnetic induction of $12.56\, T$ at its nucleus. The current produced by the motion of the electron will be (Given ${\mu _0} = 4\pi \times {10^{ - 7}}\,Wb/A - m)$

The hysteresis cycle curve for the material of a permanent magnet is:

If the frequency of $EM$ radiations is halved then the energy of $EM$ radiation will become:

A charge of $4\,\mu C$ is to be divided into two. The distance between the two divided charges is constant. The magnitude of the divided charges so that the force between them is maximum, will be.

The phenomenon by which light travels in an optical fibres is

The electric field due to an electric dipole at a distance r from its centre in axial position is E. If the dipole is rotated through an angle of 90° about its perpendicular axis, the electric field at the same point will be

Assertion $(A):$ A spherical equipotential surface is not possible for a point charge.

Reason $(R):$ A spherical equipotential surface is possible inside a spherical capacitor.

An aeroplane in which the distance between the tips of wings is 50 m is flying horizontally with a speed of 360 km/hr over a place where the vertical components of earth magnetic field is $2.0 \times 10^{-4} \mathrm{weber/m}^2$. The potential difference between the tips of wings would be