In a region where intensity of electric field is 5NC−1, 40 lines of electric force are crossing per square metre. The number of lines crossing per square metre where intensity of electric field is 10NC−1will be :
20
100
80
200
A
20
B
80
C
100
D
200
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Solution
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Number of lines of electric force crossing is equal to flux (ϕ) We know ϕ=∫E.da → By keeping area constant and doubling E, ϕ will also get doubled. ∴ Number of lines get doubled =80
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