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Physics

Key Equations

PhysicsKey Equations

20.1 Magnetic Fields, Field Lines, and Force

the magnitude of the force on an electric charge F=qvBsinθ F=qvBsinθ
the force on a wire carrying current F=IℓBsinθ F=IℓBsinθ
the magnitude of the magnetic field created by a long, straight current-carrying wire B straightwire = μ 0 I 2πr B straightwire = μ 0 I 2πr
the magnitude of the magnetic field inside a solenoid B solenoid = μ 0 NI ℓ B solenoid = μ 0 NI ℓ

20.3 Electromagnetic Induction

magnetic flux Φ=BAcosθ Φ=BAcosθ
emf E=−N ΔΦ Δt E=−N ΔΦ Δt
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