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NEET 2020 Physics question on Electrostatics

A spherical conductor of radius 10 cm has a charge of 3.2×10−73.2 \times 10^{-7} C distributed uniformly. What is the magnitude of electric field at a point 15 cm from the centre of the sphere? (14πϵ0=9×109 Nm2C−2)\left(\dfrac{1}{4\pi\epsilon_0} = 9 \times 10^9\,\text{Nm}^2\text{C}^{-2}\right)
  1. A.
    1.28×1051.28 \times 10^5 N/C
  2. B.
    1.28×1061.28 \times 10^6 N/C
  3. C.
    1.28×1071.28 \times 10^7 N/C
  4. D.
    1.28×1041.28 \times 10^4 N/C
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Correct option: A

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