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

Question

A spherical conductor of radius 10 cm has a charge of $3.2 \times 10^{-7} \mathrm{C}$ distributed uniformly. What is the magnitude of electric field at a point 15 cm from the centre of the sphere? $\left(\frac{1}{4 \pi \varepsilon_0}=9 \times 10^9 \mathrm{Nm}^2 \mathrm{C}^{-2}\right)$, 1.28 × 10 5 N C - 1, 1.28 × 10 6 N C - 1, 1.28 × 10 7 N C - 1, 1.28 × 10 4 N C - 1

MARKS App · Accepted Answer

E = k Q r 2 = 9 × 10 9 × 3 .2 × 10 − 7 15 × 10 − 2 2 E = 1 . 28 × 10 5 N C - 1

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