Part A )
given
r1 = 4 m
I2 = I1/2
r2 = ?
using relation I ( 1/r2 )
I1 / I2 = ( r2 / r1 )2
I1/ (I1/2 ) = ( r2 / 4)2
1/0.5 = r22 / 16
2 = r22 / 16
r2 = 5.6568 m
Option " Answer 1 " is r = 5.6568 m is correct.
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