Physics · PYQ NEET UG 2026

The temperature of a metallic sphere of radius \( R \) is increased by a small amount \( \Delta T \). If the linear coefficient of thermal expansion of the metal is \( \alpha \), the approximate increase in the volume of the sphere is :

1. A
   \( 2\pi R^3\alpha\Delta T \)
2. B
   \( 3\pi R^3\alpha\Delta T \)
3. C
   \( 4\pi R^3\alpha\Delta T \)
4. D
   \( 6\pi R^3\alpha\Delta T \)