1) Using the diagram, a coil of 233 turns hangs vertically from a hinge along th

Question

1) Using the diagram, a coil of 233 turns hangs vertically from a hinge along the x-axis; each turn is rectangular (sides a = 8.49 cm and b = 9.47 cm). A uniform magnetic field of magnitude 1.38 T points downward (parallel to the y-axis).  At t = 0 a switch is thrown, and a (positive) current of 7.1 A begins to flow clockwise in the loop. Calculate the net torque on the loop at t = 0, in N-m.

2) A cylindrical metal wire (length 65.9 m, end diameter 0.873 cm, mass density 3.14 kg/m3) carries current 48.9 A perpendicular the Earth's magnetic field of 6.43 T. Find the ratio FM/Fg, the magnitude of the force due to magnetism divided by the force due to gravity.

Explanation / Answer

torque = NIAXB

A = a * b = 8.49 * 9.47 *10^-4 m^2

N = 233 turns

I = 7.1

B = 1.38 T

t = 18.35 N-m

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