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A metal surface of area 1 m^(2) is charg...

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

Text Solution

Verified by Experts

The correct Answer is:
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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