Question

a) What is solenoid?

b) Draw field lines of the magnetic field through and around a current carrying s

c) What does the magnetic field pattern inside the solenoid indicate?

d) How can you predict polarity of the two ends of a solenoid?

Answer 1

A solenoid is a coil of insulated or enameled wire wound on a rod-shaped form made of solid iron, solid steel, or powdered iron.
These appear to be similar to that of a bar magnet. One end of the solenoid behaves like North Pole and the other end behaves like the South Pole. Magnetic field lines inside the solenoid are in the form of parallel straight lines. This means that the field is same at all the points inside the solenoid.
 
When soft iron rod is placed inside the solenoid, it behaves like an electro magnet. The use of soft iron as core in the solenoid produces the strongest magnetism
It indicates that the magnetic field is same at all points inside the solenoid. 
This property is utilised to magnetise a piece of magnetic material like soft iron when placed inside
the coil. 
Two ways by which strength of electromagnet
can be increased :
Increasing the amount of electric current through it.
Increasing the number of turns of the coil.

Answer 2

Answer:

a) solenoid is a coil of many circular turns of insulated copper wire wrapped closely in the shape of cylinder.

b)pic attached

c)it indicates magnetic field is same at all points inside a solenoid

d)by using Maxwell's right hand rule