Q2: Consider the rectangular loop shown in Figure below. Calculate the torque? X Z Bo=-0.6a, +0.8a, T 4 mA (1,2,0) Ans: 4.8a, mN.m

V emf Iron core with The transformershown consists of a long wire coincident with the z-axis and carrying a current I = Io coswt, coupling magnetic energy to a toroidal coil situated in the x-y plane and centered at the origin. The toroidal coil uses iron material with permeability µ. The tightly wound coil of N turns serves to induce voltage Vemf as shown in the figure. a. Develop an expression for Vem f b. Calculate Vem f for N = 100, f = 60 Hz, μ = 4000μo, a = 5 cm, b=6 cm, c = 2 cm, and Io = 50 A

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Adding a core of magnetic material to an electromagnet: Select one: allows greater current to flow. decreases AC impedance. greatly increases the inductance. eliminates the magnetic poles.