A. strong spring
B. low numbers of turns
C. small area of coil
D. soft iron core

Correct Answer: Option D

D. soft iron core

SEE ALSO  What volume of alcohol will have same mass as 4.2m³ of petrol? Density of alcohol = 8.4 x 102kgm−³, density of petrol =7.2x103kgm−³

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