NCERT Class XII Chapter <br>Electric Charges and Fields <br> Questions With Solutions

NCERT Class XII Chapter
Electric Charges and Fields
Questions With Solutions

Question : 23

Total: 34

An infinite line charge produces a field of 9 × 104 N C–1 at a distance of 2 cm. Calculate the linear charge density.

Solution:

E = 9 × 104 N C−1 , r = 2 cm = 2 × 10−2 m
As E =

2πε0r

, So , λ = 2πε0 . E =

2×9×109

× 9 × 104 × 2 × 10−2
or λ = 1 × 10−7 C m−1 = 0.1 µ C m−1

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