MCQ
The working principle of dynamo is based on :
  • A
    heating effect of current
  • electromagnetic induction
  • C
    induced magnetism
  • D
    induced current

Answer

Correct option: B.
electromagnetic induction
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

Similar questions

The number of photo-electrons emitted per second from a metal surface increases when(a) The energy of  incident photons increases (b) The frequency of incident light increases (c) The wavelength of the incident light increases(d) The intensity of the incident light increases
 
 
 
 
In vacuum the speed of light depends upon(a) Frequency(b) Wave length(c) Velocity of the source of light(d) None of these
   
   
Two spheres A and B of exactly same mass are given equal positive and negative charges respectively. Their masses after charging.
If $L$ is the coherence length and $c$ the velocity of light, the coherent time is
A proton, a neutron, an electron and an particle have same energy. Then their de Broglie wavelengths compare as:
$1$ Coulomb $= ...........$ Electro Static Unit.
If a charged particle moves unaccelerated in a region containing electric and magnetic fields,
  1. $\overrightarrow{\text{E}}$ must be perpendicular to $\overrightarrow{\text{B}}$
  2. $\overrightarrow{\text{V}}$ must be perpendicular to $\overrightarrow{\text{E}}$
  3. $\overrightarrow{\text{V}}$ must be perpendicular to $\overrightarrow{\text{B}}$
  4. E must be equal to vB.
Potential difference between the points $P$ and $Q$ in the electric circuit shown is
A charge q is moving with a velocity v parallel to a magnetic field B. Force on the charge due to magnetic field is:
If a hole is made at the centre of a bar magnet, then its magnetic moment will(a) Increase(b) Decrease(c) Not change(d) None of these