Exam Cheat Sheet — MAG-01 Last-Minute Revision — Summary

B formulas: Wire = μ_{0}I/2πd | Loop centre = μ_{0}NI/2R | Solenoid = μ_{0}nI | Toroid = μ_{0}NI/2πr
Forces: F_charge = qvB sinθ (no work!) | F_wire = BIl sinθ | F/l = μ_{0} $I_{1}I_{2}$ /2πd (same dir → attract)
Circular motion: r = mv/qB | T = 2πm/qB (NO v — velocity-independent!)
Galvanometer: Ammeter → shunt S = I_gG/(I−I_g) PARALLEL | Voltmeter → R = V/I_g − G SERIES
Materials: Dia χ<0 repelled | Para χ>0 Curie law | Ferro χ>>0 domains hysteresis above Curie temp → para