Chapter - 4 Moving Charges and Magnetism Important Questions / Topics With Handwritten Notes 2021
The CBSE quick revision notes are the comprehensive notes covering the latest revised CBSE and NCERT curriculum (2020-21). It includes all the topics given in the NCERT Class 12 Physics textbook. Users can download the CBSE Quick Revision Notes from the Yugal Class 12th Study Guide website.
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Download the handwritten free CBSE Class 12 Revision Notes for Chapter 4 Moving Charges and Magnetism in PDF format. Download the Revision Notes for Moving Charges and Magnetism Class 12 Notes and score high on exams.
Most Important And Must Do Topics of this chapter :
Q1.Derive expression for Lorentz force on a charge moving with velocity(v) in magnetic field(B).
Q2.Draw trajectory of charges(Proton/electron/deutron) entering in uniform magnetic field Also find frequency, radius of circular path & kinetic energy of particle.
Q3.Using Biot savart law find magnetic field on the axis of current carrying circular coil.
Q4.State & Prove ampere circuital law.
(Also example 4.8 NCERT page 149 based on ampere's law)
Q5. Using Ampere's circuital law find magnetic field inside Solenoid & Toroid.
Q6. Expression for torque acting on Current Carrying loop.
Q7. Derive expression for magnetic fied due to current carrying straight conductor and Parallel Conductors.
Q8. Explain Galvanometer on the basis of Principle, Construction & working. Also discuss Sensitivity of Galvanometer.
Q9. How Galvanometer can be converted in to Ammeter and Voltameter.
Note : Topics According to revised New Syllabus For 2021 Students Only .
Chapter - 4 Moving Charges and Magnetism Important Questions / Topics With Handwritten Notes 2021
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Short Revision Notes Of Moving Charges and Magnetism Class 12
Lorentz force:
Both of us know that when a test charge is moving it creates a magnetic field. Now imagine a moving charge present in both an electric field and a magnetic field. Some force is applied by both magnetic and electric fields on this charge.
This force is given by the Lorentz force.
We already know about force created due to the electric field, but in case of electric force, one thing you will notice is that we are dealing with the electric charge at the static position but a magnetic field is created due to moving electric charge and therefore here the charge is not a static state and moving continuously.
Due to this movement of electric charge, the force due to the magnetic field at a given spot depends on time as well.
So according to Lorentz force, imagine an electric charge 'q' moving with the velocity 'v' and at any particular time 't' this charge is present at some position 'r'.
Now at the particular moment of time 't' when the charge is at position 'r'. The force on the charge due to the electric field will be E(r) and force due to the magnetic field will be B(r).
So, therefore, net force on this charge 'q' will be:
F=q[E(r) + v * B(r)] = Felectric + Fmagnetic
So total force on charge q will be the combined force due to electric and magnetic field.
Bio-savart's law:
So as we know that the magnetic field is created due to current or moving electric charge. So because current creates a magnetic field, therefore there should be some relation between a current and magnetic field.
This relation between current and magnetic field is given by Bio-savart's law
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Bio-savart's law |
As you can see in the above image, this is the image of the conductor with current 'I' and due to this current in a conductor.
Let's suppose a small length (infinitely small length) of this conductor be 'dl' therefore 'dB' will be the magnetic field at point 'P' due to this element 'dl' with current 'I'.
So bio-savart's law states that: This magnetic field 'dB" is directly proportional to the amount of current 'I' and element 'dl' but it will be inversely proportional to the square of distance 'r' between element 'dl' and point 'P'.
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Bio-savart's law |
Derivation of Bio-Savart's law and all the other details are provided in our notes of this chapter 4 moving charge and magnetism.
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