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Consider a long current carrying solenoid. If Rahul plots the magnetic field lines inside this long current carrying solenoid, then it appears:
denser at the ends
to increase from one end to another
uniform at all points
denser in the middle
uniform at all points
Inside a long current-carrying solenoid, the magnetic field lines are parallel, straight, and equally spaced, which indicates that the magnetic field is uniform at all points inside the solenoid.
Inside a long current-carrying solenoid, the magnetic field lines are parallel, straight, and equally spaced, which indicates that the magnetic field is uniform at all points inside the solenoid.
Think of cars driving on a multi-lane highway where all the cars maintain the exact same speed and distance from one anotherтАФrepresenting a uniform and parallel flow.
SOLA: Solenoid = Overlapping loops = Linear field inside
B=╬╝0тАЛnI тАФ Magnetic field inside a long solenoid
n=LNтАЛ тАФ Number of turns per unit length
A solenoid is a long coil of wire containing many turns. When electric current flows through it, each turn acts like a circular current loop. Inside the solenoid, the magnetic field contributions from adjacent turns add up along the axis and cancel out radially, resulting in a strong, uniform magnetic field represented by parallel and equidistant field lines.
The magnetic field inside a long solenoid is uniform in magnitude and direction.
The field lines inside are parallel and straight.
Outside the solenoid, the magnetic field is very weak and non-uniform.
At the ends of the solenoid, the magnetic field strength drops to about half of its value at the center.
Can create a strong, controlled magnetic field.
Uniform field is ideal for scientific experiments and electromagnetic devices.
Fringe fields exist near the ends where uniformity is lost.
Electromagnets and relay switches
Particle accelerators and MRI machines
Inductors in electronic circuits
╬╝0тАЛ=4╧А├Ч10тИТ7┬аTтЛЕm/A is the permeability of free space.
Option C correctly states that the magnetic field lines appear uniform at all points inside.
C is correct тАФ uniform at all points inside a long current-carrying solenoid.
Remember that while the field is uniform inside an infinite solenoid, it becomes non-uniform near the finite ends due to fringing.
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