Class 12 Physics| Chapter 18| Magnetic field| Problem 18.8|

To find the magnetic flux density (B) inside a solenoid in 12th-grade Physics, you use the formula derived from Ampere's law:
Formula:
B = Uo n I
Explanation:
1. : Magnetic flux density inside the solenoid (in Tesla, T).
2. : Permeability of free space (Uo).
3. : Number of turns per unit length of the solenoid (, where is the total number of turns, and is the solenoid's length).
4. : Current passing through the solenoid (in Amperes, A).
Steps:
1. Measure or determine the number of turns per unit length ().
2. Measure the current () flowing through the solenoid.
3. Use the formula to calculate the magnetic flux density.
Assumptions:
The solenoid is long compared to its diameter (an ideal solenoid).
The magnetic field is uniform inside the solenoid and negligible outside.
This formula helps describe how magnetic fields are generated in solenoids and is a key concept in electromagnetism

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