Ch 04 - Moving Charges And Magnetism12th Physics
Oersted's Discovery
What was the fundamental conclusion of Hans Christian Oersted's 1820 experiment regarding straight current-carrying wires and compass needles?
What was the fundamental conclusion of Hans Christian Oersted's 1820 experiment regarding straight current-carrying wires and compass needles?
Explanation:
- Oersted concluded that moving charges or electric currents produce a magnetic field in the surrounding space.
- The alignment of the compass needle is tangential to an imaginary circle which has the straight wire as its centre and its plane perpendicular to the wire.
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Lorentz Force
Lorentz Force
State the mathematical formula for the total force experienced by a point charge moving in the presence of both electric and magnetic fields.
Variables & Units:
- = Total Lorentz Force (Newtons, N)
- q = Charge of the particle (Coulombs, C)
- = Electric field vector (V/m)
- = Velocity vector of the charge (m/s)
- = Magnetic field vector (Tesla, T)
Conditions/Notes:
- The magnetic force component () is strictly perpendicular to both the velocity and the magnetic field.
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The Tesla (Unit of Magnetic Field)
How is the SI unit of the magnetic field (1 Tesla) formally defined in terms of force, charge, and velocity?
How is the SI unit of the magnetic field (1 Tesla) formally defined in terms of force, charge, and velocity?
Explanation:
- The magnitude of the magnetic field is 1 Tesla (T) when the force acting on a unit charge (1 C), moving purely perpendicular to the field with a speed of 1 m/s, is exactly 1 Newton.
- Note: A smaller, non-SI unit is the Gauss (G), where .
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Also in this chapter
41 more cards to study in Prism
- 4Conditions for Zero Magnetic Force
- 5Magnetic Force on a Current-Carrying Conductor
- 6Work Done by Magnetic Force
- 7Frame Dependence of Magnetic Force
- 8Radius of Circular Path in Magnetic Field
- 9Cyclotron Frequency
- 10Cyclotron Principle & Electron Limitation
- 11Pitch Formula
- 12Pitch of a Helical Path
- 13Biot-Savart Law
- 14Relation: $\epsilon_0$, $\mu_0$, and c
- 15Magnetic Bottles (Plasma Confinement)
- 16Magnetic Field on Axis of Circular Loop
- 17Field at Centre of Circular Loop
- 18Biot-Savart vs. Coulomb's Law
- 19Ampere's Circuital Law
- 20Field of an Infinite Straight Wire
- 21Field Inside a Solid Cylinder
- 22Right-Hand Thumb Rule (Circular Loop)
- 23Magnetic Field of an Ideal Solenoid
- 24Helmholtz Coils
- 25Magnetic Field of a Toroid
- 26Force Between Parallel Conductors
- 27Torque on a Current Loop
- 28Magnetic Dipole Moment
- 29Forces Between Parallel Currents
- 30Magnetic Moment of a Revolving Electron
- 31Standard Definition of the Ampere
- 32Newton's 3rd Law in Electromagnetism
- 33Galvanometer Equilibrium Equation
- 34Galvanometer Sensitivities
- 35Electrostatic vs. Magnetic Dipole Analogy
- 36Ammeter Shunt Resistance Formula
- 37Gyromagnetic Ratio
- 38The Bohr Magneton
- 39Voltmeter Series Resistance Formula
- 40Moving Coil Galvanometer Principle
- 41Velocity Selector
- 42Maximum Kinetic Energy in a Cyclotron
- 43Conversion: Galvanometer to Ammeter
- 44Conversion: Galvanometer to Voltmeter
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