NCERT Class XII Chapter
Electric Charges and Fields
Questions With Solutions
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Question : 17
Total: 34
Careful measurement of the electric field at the surface of a black box indicates that the net outward flux though the surface of the box is 8.0 × 10 3 m 2 C – 1
(a) What is the net charge inside the box?
(b) If the net outward flux through the surface of the box were zero, could you conclude that there were no charges inside the box? Why or why not?
(a) What is the net charge inside the box?
(b) If the net outward flux through the surface of the box were zero, could you conclude that there were no charges inside the box? Why or why not?
Solution:
(a) ϕ = 8 × 10 3 m 2 C − 1
10 3 m 2 C − 1
or q = 8 ×10 3 ε 0 10 3 10 − 12 10 − 8
(b) As ϕ = 0 or
q net
So, the net charge enclosed by that closed surface is zero, although it may have some charges inside it.
or q = 8 ×
(b) As ϕ = 0 or
So, the net charge enclosed by that closed surface is zero, although it may have some charges inside it.
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