A metal surface of area `1 m^(2)` is charged with `sqrt(8.85)muC` in air. The mechanical force acting on it is
A metal surface of area `1 m^(2)` is charged with `sqrt(8.85)muC` in air. The mechanical force acting on it is
A. 1 N
B. 0.5 N
C. 10 N
D. 50 N
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Correct Answer - B
`F=(sigma^(2)ds)/(2in_(0)k)=q^(2)/(2in_(0)kds)`
`=((sqrt(8.85)xx10^(-6))^(2))/(2xx8.85xx10^(-12)xx1xx1)=0.5N`
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