(a) Explain magnetic behavior of a current carrying solenoid. Also, compare the pattern of the magnetic field of a solenoid with that of a bar magnet. (2)
(b) Draw magnetic field lines through and around a current carrying solenoid. (2)
Solution:
If a conducting wire is wounded in the form of a cylindrical coil whose diameter is very less in comparison to the length and the axis of the turns must be parallel to axis solenoid then this coil is called a ideal solenoid (it looks like a helical spring). The magnetic field lines in a solenoid, through which current is passed, are as shown in figure.
Magnetic field lines plotted for a bar magnet are as shown in figure.
List of the distinguishing features between the two fields:
a) The poles of the bar magnet do not lie exactly at the end of the magnet but are somewhat inside. In a solenoid, poles can be considered to be lying at the edge.
b) The magnetism retains in the bar magnet naturally but in the solenoid, the magnetism is there so long current flows through it.
c) A magnetic field of a bar magnet emanates from throughout the body of the magnet, with more intensity at the poles. While there is no field emanating from the lateral surface of the solenoid.
If a conducting wire is wounded in the form of a cylindrical coil whose diameter is very less in comparison to the length and the axis of the turns must be parallel to axis solenoid then this coil is called a ideal solenoid (it looks like a helical spring). The magnetic field lines in a solenoid, through which current is passed, are as shown in figure.
Magnetic field lines plotted for a bar magnet are as shown in figure.
List of the distinguishing features between the two fields:
a) The poles of the bar magnet do not lie exactly at the end of the magnet but are somewhat inside. In a solenoid, poles can be considered to be lying at the edge.
b) The magnetism retains in the bar magnet naturally but in the solenoid, the magnetism is there so long current flows through it.
c) A magnetic field of a bar magnet emanates from throughout the body of the magnet, with more intensity at the poles. While there is no field emanating from the lateral surface of the solenoid.