Moving Charges and Magnetism Class 12 Physics Notes – Formulas & Quick Revision

Moving Charges and Magnetism mein magnetic force, Biot-Savart law aur Ampere law aate hain. Yahan aapko is chapter ke sabse important formulas aur quick revision points free milte hain — NCERT/CBSE syllabus ke hisaab se, boards aur JEE/NEET dono ke liye.

Important Formulas & Concepts — Moving Charges and Magnetism

• F = qvB·sinθ; F = BIL·sinθ
• Circular path: r = mv/qB; T = 2πm/qB
• Biot-Savart: dB = (μ₀/4π)·I·dl·sinθ/r²
• Circular loop centre: B = μ₀I/2R; axis par: B = μ₀IR²/2(R²+x²)^(3/2)
• Ampere law: ∮B·dl = μ₀I_enc
• Solenoid: B = μ₀nI; toroid: B = μ₀NI/2πr
• Parallel wires: F/L = μ₀I₁I₂/2πd
• Moving coil galvanometer: I ∝ deflection; conversion to ammeter (shunt) / voltmeter (series R)

Quick Revision Points

• Magnetic force velocity ke perpendicular — speed nahi badalti, direction badalti hai
• Same direction currents attract, opposite repel
• Cyclotron frequency speed par depend nahi karti
• Galvanometer → ammeter: low shunt parallel; → voltmeter: high R series
• Right-hand rules confidently use karna seekho

FAQ

Conversion numericals kaise karu?

PDF mein ammeter/voltmeter conversion ke ready formulas + solved examples hain.

JEE mein isse kya aata hai?

Circular motion in B-field aur Ampere law applications — har saal.

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