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Good evening.... Answer is 4 the option. Explain sir.

Good evening....
Answer is 4 the option.
Explain sir.

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2 Answers

Arun
25758 Points
4 years ago
Dear Raju
 
Energy of sphere = Q^2 / 2C
 
 4.5 = 16 * 10^ –12 / 2C
 
C = 16 * 10^ –12 / 9
 
R = (16 * 10^ –12 / 9 ) * 9 * 10^9
 
R = 16 * 10^ –3 m = 16 mm
Venkat
273 Points
4 years ago
q: the energy stored in the electric fields produced by a metal os sphere is 4.5 J. If teh sphere contanins 4muC, its radius will be.
 
\\Energy of sphere = \frac{Q^2}{2C} \\4.5 = \frac{16 \times 10^{-12}}{2C} \\C =\frac{16 \times 10^{-12}}{9} = 4\pi \epsilon _{0}R \\ R = \frac{16 \times 10^{-12}}{9}\times \frac{1}{4 \pi \epsilon _{0}} \\ R = 9 \times 10^9\times \frac{16}{9} \times 10^{-12} \\ R= 16\times 10^{-3} \\ R=16 mm

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