A small sphere carries a charge of `20muC`. The energy density of electric field at a point 25 cm away from the centre of the sphere in air is

Question

A small sphere carries a charge of `20muC`. The energy density of electric field at a point 25 cm away from the centre of the sphere in air is

A small sphere carries a charge of `20muC`. The energy density of electric field at a point 25 cm away from the centre of the sphere in air is
A. `0.367J//m^(3)`
B. `3.67J//m^(3)`
C. `36.7J//m^(3)`
D. `3.76J//m^(3)`

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - C
`E=1/(4piin_(0)k)q/r^(2)=(9xx10^(9)xx20xx10^(-6))/(1xx625xx10^(-4))`
`=0.288xx10^(7)N//C`
`therefore" " u=1/2in_(0)kE^(2)`
`=(8.85xx10^(-12)xx1xx(0.288xx10^(7))^(2))/2`
`=36.7J//m^(3)`

5 views Answered 2023-02-05 15:29