Physics · PYQ NEET UG 2020

A spherical conductor of radius \( 10\text{ cm} \) has a charge of \( 3.2 \times 10^{-7}\text{ C} \) distributed uniformly. What is the magnitude of electric field at a point \( 15\text{ cm} \) from the centre of the sphere? (\( \frac{1}{4\pi\varepsilon_0} = 9 \times 10^9\text{ Nm}^2/\text{C}^2 \))

1. A
   \( 1.28 \times 10^{5}\text{ N/C} \)
2. B
   \( 1.28 \times 10^{6}\text{ N/C} \)
3. C
   \( 1.28 \times 10^{7}\text{ N/C} \)
4. D
   \( 1.28 \times 10^{4}\text{ N/C} \)