A spherical conductor of radius 10 cm has a charge of $3.2 imes 10^{-7} \mathrm{C}$ distributed un

Question

A spherical conductor of radius 10 cm has a charge of $3.2 	imes 10^{-7} \mathrm{C}$ distributed uniformly. What is the magnitude of electric field at a point 15 cm from the centre of the sphere? $\left(\frac{1}{4 \pi \varepsilon_{0}}=9 	imes 10^{9} \mathrm{~N} \mathrm{~m}^{2} / \mathrm{C}^{2}ight)$

Professor PC Thomas Classes · Answer

Here, $r=10 \mathrm{~cm}, q=3.2 	imes 10^{-7} \mathrm{C}$
$E=\frac{k q}{r^{2}}=\frac{9 	imes 10^{9} 	imes 3.2 	imes 10^{-7}}{225 	imes 10^{-4}}$
$E=1.28 	imes 10^{5} \mathrm{~N} / \mathrm{C}$