12. Prior to 1960, magnetic field strength was measured by means of a rotating c

Question

12. Prior to 1960, magnetic field strength was measured by means of a rotating coil gaussmeter. This device used a small loop of to the magnetic field at fairly high speed, which was conn means of slip rings, like those shown in figure gaussmeter has 500 turns, an area of 1. 4 strength is 0. 5 T, find a. 0.633 V b. 0.439 V many turns rotating on an axis perpendicular ected to an AC voltmeter by . The sensing coil for a rotating coil and rotates at 120 rpm. If the magnetic field the maximum induced emf in the coil. (10 points) c. 0.870 V d. 1.348 V 0.5 T

Explanation / Answer

A =1.4 cm^2, N =500 , w =120 rpm, B =0.5 T

from faradays law induced emf V = NABw

V = 500*1.4*10^-4*0.5*120*2*3.14/60

V =0.4396 V

correct option is (b)

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