# DQ8C_solution - Discussion 8C P212, Week 8 Small babies,...

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Discussion 8C P212, Week 8 Small babies, huge magnets, and dangerous currents A current loop that is 1m long and 0.5 m wide carries a current of 100 A and has 50 turns. It is pivoted to turn frictionlessly on an axle along the y-axis. The second pivot support is not drawn. The coil is bathed in a magnetic field of 1.2 T that points either parallel or anti-parallel to the x-axis (you decide from the figure). The moment of inertia of the coil about this pivot is I=2 kg m 2 . The baby-eye view of the coil orientation is shown to the left of the baby. Initially φ 0 = 0 meaning the coil is in the x-y plane. a) Find the initial forces on each of the 4 sides of the coil when it lies in the x-y plane as shown. Specify their magnitude and direction. () ( ) ( ) ˆˆ Only coil segments with currents along the +y and -y will have forces. The magnitudes will be 50 1.2 100 0.5 3000 . The force on the right segment (near the south pole) will be directed up alo Fn B i L A m N == Τ = ng +z . The force on the left segment (near north pole) will along -z.

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## This note was uploaded on 06/16/2011 for the course PHYS 212 taught by Professor Kim during the Spring '08 term at University of Illinois, Urbana Champaign.

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DQ8C_solution - Discussion 8C P212, Week 8 Small babies,...

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