The correct option is A −2%
The moment of inertia of a solid sphere, I=25mR2
We know that volume =43πR3
Percentage increase in volume is 3%
∴ Percentage increase in radius will be 1%.
∴ Percentage increase in moment of inertia will be 2%. As, I∝R2
Now, since angular momentum L=Iω will remain conserved. Hence, the angular velocity ω will decrease by 2% to keep the angular momentum constant.
Hence option A is the correct answer