What does the pattern of field lines inside the solenoid indicate?

Hint: This question is related to the topic magnetic field. In this solution we will study magnetic field lines of the solenoid and the pattern of field lines which is similar to the magnetic field around a bar magnet. Since in both cases magnetic lines will start from the North Pole and end at the South Pole.

Complete step by step solution:
Oersted noticed that a current carrying wire caused a noticeable deflection in a nearby magnetic compass needle. Magnetic field lines are imaginary lines used to represent magnetic fields. They describe the direction of the magnetic force. When there is an electric current in a conducting wire, a circular magnetic field is produced around the wire. A solenoid is a long coil of wire that has been bound many times into a tightly packed coil ; it has a shape of a long cylinder . The field lines inside the solenoid are south to north pole in the form of parallel straight lines which are uniform in nature. This indicates that the magnetic field is uniform inside the solenoid. The strength of the magnetic field around a solenoid can be increased depends on the following factors:
1. Increasing number of turns on the Coil.
2. Increasing the current
3. Placing an iron core inside the solenoid.
The pattern of magnetic field lines of a current carrying solenoid is as follows:

The Earth is like one big bar magnet. The Earth magnetic field is 1000 times weaker than a typical bar magnet. Magnetic resonance imaging machines use magnets Electromagnet uses electricity to create their power of magnetism .They can be turned on and off when the electricity is turned on and off. Cranes use huge electromagnets to pick up scrap metals in junkyards .Powerful magnets are used in high speed trains, called maglev. These trains run very efficiently because these trains will float over its track and reduce friction. Many roller coasters use electromagnets to push the cars along the tracks.

Note: The most powerful magnet in the universe is actually a star called a Magnestar. Magnets have been used to study bee communication patterns. Strong rare magnet can turn some metal into a magnet. Some farmers give their cow a magnet to swallow to prevent accidental eating of nails. Breakfast cereals often contain iron, some cereals contain enough iron that its pieces are attracted to a magnet.