Electromagnetism Physics - Moving Charges and Magnetism

Those preparing for board and competitive exams State Board, CBSE, ICSE , IGCSE, MHT-CET & NEET

Udemy
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English
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Science
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13
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3.5 hours
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Mar 2022
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$39.99
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What you will learn

Introduction

Magnetic Force

Motion in a Magnetic Field

Motion in combined electric and magnetic fields

Magnetic field due to a current element ; Biot-Savart law

Magnetic field on the axis of circular current loop

Ampere's circuital law

The solenoid and the toroid

Force between two parallel currents ; the Ampere

Torque on current loop ; magnetic dipole

The moving coil galvanometer

Description

Moving Charges and Magnetism

  • Concept of magnetic field −

    • Oersted’s experiment

  • Biot - Savart law and its application to current carrying circular loop

  • Ampere’s law and its applications to infinitely long straight wire

  • Straight and toroidal solenoids

  • Force on a moving charge in uniform magnetic and electric fields

  • Cyclotron

  • Force on a current-carrying conductor in a uniform magnetic field

  • Force between two parallel current-carrying conductors-definition of ampere

  • Torque experienced by a current loop in uniform magnetic field; moving coil galvanometer-its current sensitivity and conversion to ammeter and voltmeter.

SUMMARY

1. The total force on a charge q moving with velocity v in the presence of magnetic and electric fields B and E, respectively is called the Lorentz force. It is given by the expression: F = q (v × B + E) The magnetic force q (v × B) is normal to v and work done by it is zero.

2. A straight conductor of length l and carrying a steady current I experiences a force F in a uniform external magnetic field B, F = I l × B where|l| = l and the direction of l is given by the direction of the current.

3. In a uniform magnetic field B, a charge q executes a circular orbit in a plane normal to B. Its frequency of uniform circular motion is called the cyclotron frequency. This frequency is independent of the particle’s speed and radius. This fact is exploited in a machine, the cyclotron, which is used to accelerate charged particles.

4. The Biot-Savart law asserts that the magnetic field dB due to an element dl carrying a steady current I at a point P at a distance r from the current element

5. The magnitude of the field B inside a long solenoid carrying a current I is B = µ0 nI.

6. Parallel currents attract and anti-parallel currents repel.

7. A planar loop carrying a current I, having N closely wound turns, and an area A possesses a magnetic moment m where, m = N I A and the direction of m is given by the right-hand thumb rule : curl the palm of your right hand along the loop with the fingers pointing in the direction of the current. The thumb sticking out gives the direction of m (and A) When this loop is placed in a uniform magnetic field B, the force F on it is: F = 0 And the torque on it is, τ = m × B In a moving coil galvanometer, this torque is balanced by a countertorque due to a spring, yielding kφ = NI AB. where φ is the equilibrium deflection and k the torsion constant of the spring.

8. A moving coil galvanometer can be converted into a ammeter by introducing a shunt resistance r s , of small value in parallel. It can be converted into a voltmeter by introducing a resistance of a large value in series.

Content

MOVING CHARGES & MAGNETISM

Right Hand Palm Rule
Magnetic Field Due to Circular Loop at Different Places
Magnetic Field at Center of Current Carrying Loop
Magnetic Field Due to Circular Coil Carrying Current
Fleming's Left Hand Rule
Magnetic Field Due to Long Straight Current Carrying Conductor
Magnetic Induction Due to Long Straight Current Carrying Wire
Cyclotron
Radius Traced by a Particle Inside the Cyclotron
Time Taken by Particle to Trace a Circular Path Inside the Cyclotron
Time Taken by Charge Particle to Move in Semicircular Path Inside the Cyclotron
Maximum Kinetic Energy Particle Inside the Cyclotron
Biot - Savart's Law
Ampere's Law
First Application of Ampere's Law
Magnetic Induction to Cylindrical Loop
Solenoid Derivation
Toroid
Helmholtz Coils
Galvanometer
Construction and Working of MCG
MCG (Derivation)
Sensitivity MCG
Accuracy of MCG
Oersted Experiment

Numericals (Level 1 | Level 2 | Level 3)

Numericals on Magnetic Charges and Fields (LEVEL - 1) Question - 1
Numericals on Magnetic Charges and Fields (LEVEL - 1) Question - 2
Numericals on Magnetic Charges and Fields (LEVEL - 1) Question - 3
Numericals on Magnetic Charges and Fields (LEVEL - 1) Question - 4
Numericals on Magnetic Charges and Fields (LEVEL - 1) Question - 5
Numericals on Magnetic Charges and Fields (LEVEL - 1) Question - 6
Numericals on Magnetic Charges and Fields (LEVEL - 2)
Numericals on Magnetic Charges and Fields (LEVEL - 3)

Screenshots

Electromagnetism Physics - Moving Charges and Magnetism - Screenshot_01Electromagnetism Physics - Moving Charges and Magnetism - Screenshot_02Electromagnetism Physics - Moving Charges and Magnetism - Screenshot_03Electromagnetism Physics - Moving Charges and Magnetism - Screenshot_04

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udemy ID
3/7/2022
course created date
3/19/2022
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