Moving Charges and Magnetism:Class 12 Physics NCERT Chapter 4

Key Features of NCERT Material for Class 12 Physics Chapter 4 – Moving Charges and Magnetism

In the previous Chapter 3:Current electricity we have learned about electricity,some laws and rules regarding electricity.In this Chapter 4:Moving Charges and Magnetism we will learn about the concepts of Moving Charges and Magnetism.

Quick revision notes

1. The space in the environmental factors of a magnet or a current-conveying conductor where its attractive impact can be experienced is called attractive field. Its SI unit is Tesla (T). 
2. Oersted experimentallyexhibited that the current-conveying conductor produces attractive field around it. 

At the point when key K is shut, at that point diversion happens in the compass needle and the other way around, 

3. Biot-Savart’s Law According to this law, the attractive field because of little; current-conveying component dl at any close by point P is given by
4. The connection between μ0, ε0 and c is

where, c is speed of light, ε0 is permittivity of free space and μ0 is attractive penetrability. .

5. Attractive field at the focal point of a roundabout current-conveying conductor/curl.
6. Magnetic fieldat the focal point of semi-roundabout current-conveying conductor. 

       

7. Magnetic field at the focal point of a curve of round current-conveying conductor which subtends an edge 0 at the middle. 

8. Magnetic field  anytime lies on the hub of round current-conveying conductor
9. Magnetic field because of straight current-conveying conveyor anytime P a good ways off r from the wire is given by
10. The accompanying figure shows the graphical portrayal of variety of B with good ways from straight conductor. 
11. Ampere’s Circuital Law The line essential of the attractive field B around any shut circle is equivalent to μ0 times the absolute current I stringing through the circle, for example 

Greatness of attractive field of a straight wire utilizing Ampere’s law 

12. Maxwell introduced the idea of removal current
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 closures of the solenoid, 

B = 1/2 μ0nI 

14. Attractive Field because of Toroidal Solenoid 

(I) Inside the toroidal solenoid, 

B =μ0nI, here, n =N/2πr ,N= all out number of turns 

(ii) In the open space, inside or outside of toroidal solenoid, 

B= 0