Question
principle of an electric motor ?

Answer

Principle: An electric motor (dc motor) works on the principle that when an electric current is passed through a conductor placed normally in a magnetic field, a force acts on the conductor as a result of which the conductor begins to move and mechanical energy is obtained.

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

With reference to the diagram shown below calculate:

(i) The equivalent resistance between $P$ and $Q.$
(ii) The reading of ammeter.
(iii) The electrical power between $P$ and $Q.$
State two differences between light waves and sound waves.
Ice-cream at 0°C feels colder than water at 0°C. Give reason for this observation.
The figure shows a radioactive source S placed in a thick-walled lead container. The radiations given off pass through a magnetic field acting in direction perpendicular to the plane of paper inwards as shown by X. Copy the diagram and show the path of radiations. Explain why the source is kept in a thick-walled lead container.
Define the term refractive index of a medium. What do you understand by the statement 'the refractive index of glass is 1.5 for white light'?
Define the term magnifying power of a simple microscope. How does it depend on the focal length of the lens used?
In following figure ,, F1 and F2 are the positions of the two foci of the thin lenses shown in diagram (a) and (b) draw accurately the path taken by the light ray AB after it emerges from the lens in each diagram (a) and (b).

State three properties of α-rays.
(a) Define the term current and state its SI unit.
(b) Six resistances are connected together as shown in the figure. Calculate the equivalent resistance between the points $A$ and $B$.
Image
Name the atoms of a substance having same atomic number, but different mass numbers. Give one example of such a substance. How do the structures of such atoms differ?