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< h1 id = "study-topic-title" style = "font-size: 2.5rem; margin-bottom: 1rem;" > Electricity & Magnetism Questions & Formulas
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1. Electric Charge and Field
Charges exert forces given by Coulomb's Law. Electric field is force per unit charge.
2. Current and Resistance
- Ohm's Law: V = IR.
- Resistivity: R = ρL/A.
- Power: P = VI = I²R.
3. Magnetism
Moving charges create magnetic fields. Lorentz Force: F = q(v × B). Faraday's Law explains induced EMF due to changing magnetic flux.