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What is a solenoid? Draw the pattern of magnetic field lines of (i) a current-carrying solenoid and (ii) a bar magnet. List two distinguishing features between the two fields.
A solenoid is a long coil that contains a large number of close turns of insulated copper wire. Its ends are connected to a battery B through a switch X.
(i) The magnetic field lines of a current-carrying solenoid are shown in the figure given below:
(ii) The magnetic field lines of a bar-magnet are shown in the figure given below:
Two distinguishing features between the two fields are:
| Solenoid | Bar Magnet |
1. Its magnetic field strength can be changed by changing the amount of current or core of the solenoid. | 1. Its magnetic field strength is fixed, and cannot be changed.
|
2. Its poles can be interchanged by changing the direction of the current. | 2. Its pole cannot be interchanged i.e. field direction is fixed. |
Updated on: 10-Oct-2022
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