Here are the detailed Moving Charges and Magnetism Class 12 Notes Chapter 4. Thus the notes will be very helpful in preparation for examinations. Class 12 Physics notes cover all the important topics that are listed. It gives students a basic understanding of the past and the development of laws in physics. https://meritbatch.com/moving-charges-magnetism-cbse-notes-class-12-physics/
Moving Charges and Magnetism Class 12 Notes Chapter 4
Moving Charges And Magnetism Class 12 Notes
1. The space in the surroundings of a magnet or a current-carrying conductor in which its magnetic influence can be experienced is called magnetic field. Its SI unit is Tesla (T).
Moving Charges And Magnetism Notes
2. Oersted experimentally demonstrated that the current-carrying conductor produces magnetic field around it.
When key K is closed, then deflection occurs in the compass needle and vice-versa,
Class 12 Physics Chapter 4 Notes
3. Biot-Savart’s Law According to this law, the magnetic field due to small; current-carrying element dl at any nearby point P is given by
Moving Charges And Magnetism
4. The relationship between μ0, ε0 and c is
where, c is velocity of light, ε0 is permittivity of free space and μ0 is magnetic permeability.
5. Magnetic field at the centre of a circular current-carrying conductor/coil.
Moving Charges And Magnetism Class 12 Notes Pdf
6. Magnetic field at the centre of semi-circular current-carrying conductor.
7. Magnetic field at the centre of an arc of circular current-carrying conductor which subtends an angle 0 at the centre.
8. Magnetic field at any point lies on the axis of circular current-carrying conductor
9. Magnetic field due to straight current-carrying conductor at any point P at a distance r from the wire is given by
10. The following figure shows the graphical representation of variation of B with distance from straight conductor.
11. Ampere’s Circuital Law The line integral of the magnetic field B around any closed loop is equal to μ0 times the total current I threading through the loop, i.e.
Magnitude of magnetic field of a straight wire using Ampere’s law
12. Maxwell introduced the concept of displacement current.
Moving Charges And Magnetism Class 12
13. Magnetic Field due to a Straight Solenoid
(i) At any point inside the solenoid,
B = μ0nI
where, n = number of turns per unit length.
(ii) At the ends of the solenoid,
B = 1/2 μ0nI
Cbse Class 12 Physics Chapter 4 Notes
14. Magnetic Field due to Toroidal Solenoid
(i) Inside the toroidal solenoid,
B =μ0nI, here, n =N/2πr ,N= total number of turns
(ii) In the open space, interior or exterior of toroidal solenoid,
B= 0
