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JEE · Physics · Magnetism & Electromagnetic Induction doubts
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JEEPhysicseasy
What does “Magnetic force on a moving charge” actually mean in Magnetism & Electromagnetic Induction, and why does it matter for JEE?
F = qvB·sinθ, always perpendicular to the velocity, so it changes direction but not speed.
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JEEPhysicsmedium
I keep getting “Magnetic force on a moving charge” questions wrong in Magnetism & Electromagnetic Induction. What's the trap?
thinking the magnetic force can speed a charge up.
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JEEPhysicseasy
What does “Faraday's law of induction” actually mean in Magnetism & Electromagnetic Induction, and why does it matter for JEE?
a changing magnetic flux induces an EMF, EMF = −dΦ/dt.
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JEEPhysicsmedium
I keep getting “Faraday's law of induction” questions wrong in Magnetism & Electromagnetic Induction. What's the trap?
expecting a steady (unchanging) magnetic field to induce an EMF.
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JEEPhysicseasy
What does “Lenz's law” actually mean in Magnetism & Electromagnetic Induction, and why does it matter for JEE?
the induced current always opposes the change that produced it, ensuring energy conservation.
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JEEPhysicsmedium
I keep getting “Lenz's law” questions wrong in Magnetism & Electromagnetic Induction. What's the trap?
getting the direction of induced current backwards.
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JEEPhysicseasy
What does “Magnetic flux” actually mean in Magnetism & Electromagnetic Induction, and why does it matter for JEE?
Φ = B·A·cosθ — the amount of field passing through a loop.
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JEEPhysicsmedium
I keep getting “Magnetic flux” questions wrong in Magnetism & Electromagnetic Induction. What's the trap?
ignoring the angle between the field and the loop's normal.
Magnetism & Electromagnetic InductionRead →