Question
What is a solenoid? Why do we usually keep its diameter small in comparison to its length?
✓
Answer
If a conducting wire (coated with an insulating paint or varnish) is closely wound on a (long) cylindrical core, the resulting coil is referred to as solenoid. It is usual to keep the diameter of the solenoid small compared to its length. This is done to bring about a greater degree of uniformity (and simplicity) in the axial magnetic field of the solenoid.
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, why are big tubs of water kept in underground cellars for storing fresh fruit and vegetables in cold countries.
Name two main sources of nuclear radiations. How are these radiations harmful?
Name and state the law which determines the direction of induced current.
or
State Fleming’s right-hand rule.
The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B. represents the parallel combination? Give reasons for your answer.
(a) Name one factors on which the frequency of sound emitted due to vibrations in an air column depends.
(b) How does the frequency depend on the factor stated in part (a).
Fig shows a lens as a combination of a glass block and two prisms.
(i) Name the lens formed by the combination.
(ii) What is the line XX' called?
(iii) Complete the path of the incident ray PQ after passing through the lens.
(iv) The final emergent ray either meets XX' at a point or appears to come from a point on XX'. Label it as F, What is this point called?
(i) Name the lens formed by the combination.
(ii) What is the line XX' called?
(iii) Complete the path of the incident ray PQ after passing through the lens.
(iv) The final emergent ray either meets XX' at a point or appears to come from a point on XX'. Label it as F, What is this point called?
A moving body weighing $400 \ N$ possesses $500 \ J$ of kinetic energy. Calculate the velocity with which the body is moving. $(g = 10 ms^2)$
→The smoke from the gun barrel is seen 2 seconds before the explosion is heard. If the speed of sound in air is $340 ms^{−1},$ calculate the distance of the observer from the gun. State the approximation used.
→In the diagram XY is a straight conductor carrying current in the direction marked by the arrow. The conductor is held vertical by passing it through a horizontal cardboard sheet.
Draw three magnetic lines of force on the board and mark the direction of magnetic field in your diagram. State two factors on which magnitude of magnetic field at a point, depends.
Draw three magnetic lines of force on the board and mark the direction of magnetic field in your diagram. State two factors on which magnitude of magnetic field at a point, depends.
How is a cathode ray beam affected while passing through a magnetic field?