Eddy currents may be reduced by using: (1) thick piece of cobalt \( \mathrm{P} \) (2) thick piec...

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Eddy currents may be reduced by using:
(1) thick piece of cobalt
\( \mathrm{P} \)
(2) thick piece of nickel
W
(3) laminated core of steel
(4) laminated core of soft iron
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