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Solenoid

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what is the difference in the pattern of magnetic field due to a circular loop and inside a solenoid?

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Q. (a) What is a solenoid? Draw a sketch of the pattern of field lines of the magnetic field through and around a current carrying solenoid.
(b) Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right hand rule to find out the direction of the magnetic field inside and outside the loop.

Q. What is the pattern of magnetic field inside the solenoid ?

Q. Question 4
For a current in a long straight solenoid N- and S-poles are created at the two ends. Among the following statements, the incorrect statement is

(a) The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid
(b) The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil
(c) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet
(d) The N- and S-poles exchange position when the direction of current through the solenoid is reversed

Q. Assertion :Magnetic field due to current carrying solenoid is independent of its length and cross-sectional area. Reason: The magnetic field inside the solenoid is uniform.

How is the magnetic field due to a solenoid carrying current affected if a soft iron bar is introduced inside the solenoid?

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