Physics
Magnetism and Electromagnetic Induction Explained
By Dr. Sandhya Classes Editorial Team · Published 2026-10-03 · Updated 2026-10-03 · 3 min read
Magnetic effects of current, Faraday's law, Lenz's law and AC basics for Class 12.
Physics at Dr. Sandhya Classes is taught personally by Dr. Sandhya, Ph.D. in Physics, teaching since 2015 — offline in Zirakpur (Highland Marg & Lohgarh Road) and online across India. About Dr. Sandhya
Moving charges create fields
Biot-Savart and Ampère's laws describe fields from currents. Use the right-hand rules carefully.
Force on moving charges
The Lorentz force explains circular motion of charged particles and the working of devices like the cyclotron.
Faraday and Lenz
A changing magnetic flux induces an emf; Lenz's law gives its direction by opposing the change.
AC circuits
Phasor diagrams make LCR circuits and resonance much easier to understand.
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