An MRI technician moves his hand from a region of very low magnetic field strength into an MRI scanner’s 1.7 T field with his fingers pointing in the direction of the field. (a) Find the average emf induced in his wedding ring, given its diameter is 2.4 cm and assuming it takes 0.2 s to move it into the field.

0.004 V or 4 mV

Explanation:

Parameters given:

Magnetic field, B = 1.77 T

Number of turns, N = 1

Diameter = 2.4 cm ; Radius, r = 1.2cm = 0.012 m

Time taken, t = 0.2 s

Induced EMF is given as:

EMF = (B * pi * r² *N) / t

EMF = (1.77 * 3.142 * 0.012² * 1) / 0.2

EMF = 0.004 V = 4 mV

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explanation:

0.863333

86%

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