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The sensitivity of MCG can be increased by

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Increasing the area of the coil

Descreasing the number of turns in the coil

decreasing the strength of the magnetic field at coil

Increasing the torsional constant of suspension fiber

answer is A.

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Detailed Solution

$i = \frac{C}{B A N} θ$
${}_{s e n i t i v i t y}^{c u r r e n t}. \frac{θ}{i} = \frac{B A N}{C}$
Senitivity is increases by increasing A, increasing B, increasing N and decreasing C.

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