A) 20
B) 80
C) 100
D) 200
Correct Answer: B
Solution :
(b) 80 Number of lines of electric field crossing is equal to flux \[\left( \phi \right)\]. We know that, \[\phi =\int{E\,.\,\,ds}\] By keeping area constant and doubling \[E,\,\phi \]will also get doubled. No. of lines \[=2\times 40=80\]You need to login to perform this action.
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