A 105-turn square wire coil of area 0.040 m2 rotates about a vertical axis at 14

Question

A 105-turn square wire coil of area 0.040 m2 rotates about a vertical axis at 1440 rev/min, as indicated in the figure below. The horizontal component of Earth's magnetic field at the location of the loop is 2.0 x 10-5 T. Calculate the maximum emf induced in the coil by Earth's field. V A technician wraps wire around a tube of length 33 cm having a diameter of 7.8 cm. When the windings are evenly spread over the full length of the tube, the result is a solenoid containing 560 turns of wire. Find the self-inductance of this solenoid. mH If the current in this solenoid increases at the rate of 6 A/s, what is the self-induced emf in the solenoid? mV

Explanation / Answer

1) Emax = B*A*w*N = 2*10^(-5)*0.04*(144*pi/3)*105 =0.0126V 2) use formula L=

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